SEO: The Definitive Guide to Search Engine Optimization

SEO means earning visibility in unpaid (organic) search results by making your pages relevant, trustworthy, technically sound, and genuinely useful. Done well, it brings a compounding stream of visitors who are actively looking for what you offer — without paying per click.

🎯

Who it's for

Developers, content creators, founders, marketers, and students who want a trustworthy, current reference in their own language.

🧭

What you'll learn

The four pillars — technical, on-page, content/E-E-A-T, and off-page — plus measurement, AI search, and the tools that make it practical.

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How it's organized

Read top-to-bottom to learn, or jump around with the sidebar. Every snippet has a copy button; the whole guide prints cleanly to PDF.

The four pillars of SEO — technical, on-page, content and E-E-A-T, and off-page — supporting rankings and visibility. — SEO is a balance of four pillars. Neglect one and it caps the impact of the others.

Tip. New to SEO? Read in order. Need a reference? Use the sidebar or your browser's find (Ctrl/Cmd + F). This guide is free and open-source — see how to contribute at the end.

This is a companion to the open guides GEO Basics (optimizing for AI answer engines) and Dublin Core Basics (metadata). SEO is the foundation all of them build on.

A simplified pipeline. Each stage is a place where SEO can help — or hurt — your visibility.

1. Crawling — discovery

Bots (Google uses Googlebot) discover URLs by following links and reading your XML sitemap. Large sites have a practical crawl budget, so a clean internal-linking structure and a robots.txt that doesn't waste crawls on junk pages both matter.

2. Indexing — understanding & storage

Google parses each page, renders it (executing JavaScript), and stores it in the index. Not everything crawled gets indexed: thin, duplicate, or blocked pages may be skipped. Use canonical tags to consolidate duplicates and noindex to keep low-value pages out.

3. Ranking — scoring relevance & quality

For each query, algorithms weigh hundreds of signals: relevance to the search, content helpfulness and E-E-A-T, links, page experience, freshness, and the user's language and location. There is no fixed formula, and it changes constantly.

4. Serving & rendering

The best results are returned as blue links, rich results, featured snippets, and AI Overviews. Because Google renders JavaScript, client-side-only content can be slower and riskier to index — prefer server-rendered or static HTML for anything that must rank.

Mental model. Make every important page easy to crawl, easy to understand, and clearly worth ranking. The rest of this guide is just detail on those three ideas.

The four types of search intent

Intent	The user wants to…	Example query
Informational	Learn something	“what is hreflang”
Navigational	Reach a specific site/page	“search console login”
Commercial	Compare before buying	“best free seo tools”
Transactional	Do or buy something now	“hire seo consultant”

Identify the dominant intent for a keyword by looking at what already ranks. If page one is all tutorials, Google has decided the intent is informational — a product page won't break in.

How to find keywords (for free)

Mine your own Search Console “Performance” report for queries you already get impressions for.
Use Google autocomplete, “People also ask”, and “Related searches.”
Try free tools: Google Keyword Planner, Bing Webmaster keyword research, and open-source options in the Tools section.

Evaluate & organize

Weigh search volume against difficulty and, most of all, intent match. Favor long-tail keywords (longer, specific phrases) early on — they're easier to win and convert better. Group related keywords into topic clusters: one in-depth pillar page linking to focused sub-pages. This builds topical authority and a clean internal-link structure.

Rule of thumb. Write one page per intent, not per keyword variation. Optimize for the question behind the words.

Title tag — your most important on-page element

The <title> is what shows as the clickable headline in results and the browser tab. Keep it roughly 50–60 characters, put the primary keyword near the front, make it compelling, and keep it unique per page. Include your brand at the end.

Meta description — your ad copy

Not a ranking factor, but it strongly affects click-through rate. Write ~150–160 persuasive characters that include the keyword (it gets bolded) and a reason to click. Google may rewrite it, so treat it as a strong suggestion, not a guarantee.

Heading hierarchy

Use exactly one <h1> for the page topic, then logical <h2> and <h3> levels. Don't skip levels and don't choose headings for their size — they describe structure, which screen readers and search engines both rely on.

Content that matches intent

Answer the searcher's question thoroughly and originally. Cover the topic, not just the keyword: related questions, examples, and the next step. Make it scannable with short paragraphs, lists, and descriptive subheadings.

URLs, internal links & images

URLs: short, lowercase, hyphen-separated, and readable — /seo/on-page beats /p?id=812.
Internal links: link related pages with descriptive anchor text. This spreads authority and helps crawlers find content.
Image alt text: describe what the image shows. It aids accessibility and image search — see Image & video SEO.

One page, one job. Each URL should target one clear topic and intent, with one title and one H1. Copy-paste the full optimized <head> from Snippets.

XML sitemaps

List your canonical, indexable URLs in a sitemap.xml, keep lastmod accurate, and submit it in Search Console. It's a discovery aid, not a ranking lever — don't list redirects, error pages, or noindex URLs.

robots.txt

Controls crawling, not indexing. Allow the resources (CSS/JS) Google needs to render your pages, block genuinely useless paths, and reference your sitemap. Grab a ready template from Snippets.

Canonical tags

When the same content lives at multiple URLs (parameters, http/https, trailing slashes), a <link rel="canonical"> tells Google which one to index. The preferred page should reference itself.

Redirects

Use 301 for permanent moves (passes signals) and 302 for temporary ones. Avoid redirect chains and loops — each hop wastes crawl budget and link equity.

HTTPS, mobile-first & architecture

HTTPS is a baseline requirement and a light ranking signal.
Mobile-first indexing: Google indexes the mobile version, so it must contain the same content and structured data as desktop.
Flat architecture: keep important pages within a few clicks of the homepage; group content into logical sections.
Crawl budget: on large sites, avoid infinite URL spaces (faceted filters, session IDs) and consolidate thin pages.

Careful. A robots.txt Disallow is not the same as noindex. A blocked URL can still be indexed (without its content) if it's linked. To remove a page from the index, allow crawling and add a noindex robots meta tag.

The recommended format is JSON-LD: a <script type="application/ld+json"> block, far easier to maintain than inline Microdata or RDFa. Mark up content that is actually visible on the page, and follow Google's structured-data guidelines.

Types worth knowing

Content

Article, BlogPosting, FAQPage, HowTo, BreadcrumbList, VideoObject.

Business & commerce

Organization, LocalBusiness, Product, Review / AggregateRating, Event.

Why it matters

Structured data can earn rich results — star ratings, FAQ drop-downs, breadcrumbs, prices, recipe cards — that take up more space and lift click-through. It's not a direct ranking boost, but it helps engines (and AI answer systems) trust and reuse your content.

Meta moment. This very page ships Article, FAQPage, BreadcrumbList, and Organization JSON-LD. Grab the template in Snippets and validate it with the tools in Generators.

Metric	Measures	“Good” (2026)
LCP — Largest Contentful Paint	Loading: when the main content appears	≤ 2.5 s
INP — Interaction to Next Paint	Responsiveness to taps/clicks (replaced FID in 2024)	≤ 200 ms
CLS — Cumulative Layout Shift	Visual stability: unexpected movement	≤ 0.1

How to improve each

LCP: serve from a CDN, compress and correctly size the hero image, preload it, and remove render-blocking CSS/JS.
INP: ship less JavaScript, break up long tasks, and defer non-critical scripts so the main thread stays free for interactions.
CLS: always set width/height (or aspect-ratio) on images and embeds, and reserve space for anything that loads late.

How to measure

Use PageSpeed Insights (real-field + lab data), Lighthouse, the web-vitals JavaScript library for real-user monitoring, and the Core Web Vitals report in Search Console. All are free — see Tools.

Practice what we preach. This guide is static HTML with minimal JavaScript, a system-font fallback, and explicitly sized images — so it stays fast and stable by default.

hreflang in three rules

Every page lists all language/region versions, including itself.
Annotations must be reciprocal — if A points to B, B must point back to A.
Use valid codes (en, pt-BR, es) and add x-default for a fallback.

Roughly half of all Google searches are in languages other than English — multilingual SEO is opportunity, not overhead. Grab the ready hreflang block in Snippets.

Which URL structure?

Structure	Example	Trade-off
Subdirectory recommended	`example.com/es/`	Consolidates authority on one domain. Easiest to maintain.
ccTLD	`example.es`	Strongest geo-signal, but splits link authority across domains.
Subdomain	`es.example.com`	Middle ground; treated as somewhat separate.

Localize, don't just translate

Have a native speaker review copy, do local keyword research (people search differently), and adapt currency, examples, and tone. Thin machine translation reads as low-quality and can be filtered.

Live example. This guide ships in English, Portuguese, and Spanish with reciprocal hreflang and x-default → English. Use the language switcher in the top bar to see it work.

Why links still matter

A link is a vote of confidence. Quality and relevance beat quantity: one link from a respected, on-topic site is worth more than hundreds from low-quality directories. Links also help discovery and pass authority through your internal structure.

Earn links the durable way

Create genuinely linkable assets: original data, free tools, definitive guides (like this one).
Do digital PR and offer expert commentary journalists can cite.
Contribute guest articles to reputable, relevant publications.
Find broken links to dead resources in your niche and offer your page as the replacement.

Anchors & link attributes

Aim for natural, varied anchor text. Mark paid or untrusted links with rel="sponsored" or rel="nofollow", and user-generated links with rel="ugc".

Avoid. Buying links, private blog networks (PBNs), and mass directory spam are link schemes. Google devalues or penalizes manipulation. Only use the disavow tool for genuinely toxic, unnatural links you can't remove.

E-E-A-T isn't a single score you can tweak; it's a lens raters and systems use to judge whether a page deserves trust. You earn it by demonstrating first-hand experience, real expertise, recognized authority, and trustworthiness through accuracy and transparency.

People-first, helpful content

Write for humans first. Content that fully satisfies the searcher's intent — with specifics, examples, and the next step — is what Google's “helpful content” systems reward. Content written mainly to game rankings tends to get filtered.

Show who's behind it

Name the author and show real credentials or experience.
Make publisher, contact, and editorial info easy to find.
Show dates and cite primary sources.

Using AI to write

AI-assisted content can rank — if a knowledgeable human reviews it for accuracy, adds original insight or data, and it genuinely helps the reader. Mass-produced, unreviewed AI filler is exactly what quality systems target.

Gut check. “Would I trust this page if I landed on it cold?” If not, add the author, the evidence, the date, and the first-hand detail only you can provide.

Google Business Profile is the engine

Claim and fully complete your Google Business Profile: accurate categories, hours, service area, photos, and regular posts. It's the single biggest lever for local visibility.

Reviews & reputation

The quantity, recency, average rating, and your responses to reviews all feed local ranking — and they're what convince humans to choose you.

NAP consistency & schema

Keep your Name, Address, Phone (NAP) identical across your site and every directory/citation.
Add LocalBusiness structured data with address, geo coordinates, hours, and telephone.

Consistency wins. Google cross-checks your Business Profile, on-site LocalBusiness schema, and third-party citations. When they agree, it trusts your location data.

Images

Descriptive filenames: red-running-shoes.webp, not IMG_8842.jpg.
Alt text: describe what's in the image for screen readers and image search — don't keyword-stuff.
Modern formats: WebP or AVIF cut bytes dramatically versus JPEG/PNG.
Responsive & sized: use srcset and always set width/height to protect CLS.
Lazy-load below the fold with loading="lazy" — but never the LCP image.

Video

Add VideoObject structured data (title, description, thumbnail, upload date, duration).
Provide transcripts and captions — accessible, and indexable text engines and AI can read.
Choose a hosting strategy: YouTube for reach and its own search, or self-hosting for control.

LCP gotcha. Don't lazy-load your hero/LCP image — it delays the very metric you're trying to improve. Mark it fetchpriority="high" or preload it instead.

AI answer engines retrieve candidate pages, evaluate them, synthesize a response, and sometimes cite sources. The eligibility rules are the SEO rules you already know: be crawlable, helpful, well-structured, and trustworthy. AI search doesn't replace SEO — it raises the reward for doing it well.

What makes a page citable

Give a clear, direct answer near the top, then support it with detail.
Be factually accurate and scannable (headings, lists, definitions).
Show strong E-E-A-T and add structured data.
Keep content fresh — AI systems favor current, maintained sources.

No magic markup. Google states there's no special tag (or required llms.txt) that guarantees AI visibility — helpful, people-first content with sound SEO is the path. Go deeper in the dedicated GEO Basics guide ↗.

Google Search Console free · essential

The source of truth: indexing & coverage, the Performance report (queries, clicks, CTR, average position), Core Web Vitals, URL inspection, and sitemap submission. Verify your site on day one.

Bing Webmaster Tools free

Bing also powers some AI assistants. You get crawl insights, indexing, free keyword research, and backlink data.

Analytics — privacy-friendly & open-source

Track organic traffic, engagement, and conversions. Open-source, privacy-respecting options include Plausible, Umami, Matomo, and GoatCounter — see Tools.

Start here. If you do one thing today, verify your site in Search Console and submit your sitemap. Everything else builds on that data.

Common mistakes (fixable)

Accidental noindex or robots.txt blocks on live pages
Duplicate content without canonicals
Slow, layout-shifting pages
Thin or auto-translated content
Ignoring search intent; keyword stuffing
Broken links and redirect chains
Missing alt text and internal links
Never opening Search Console

Black-hat (don't)

Cloaking & sneaky redirects
Doorway pages
Hidden text or links
Link schemes & PBNs
Scraped or “spun” content
Fake reviews

Not worth it. Black-hat tactics may work for a while, then a core or spam update erases the gains — and the trust. Sustainable SEO always wins the long game.

SEO-ready <head>

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Page title — 50–60 characters with your keyword</title>
  <meta name="description" content="Compelling 150–160 character summary that earns the click.">
  <meta name="robots" content="index, follow">
  <link rel="canonical" href="https://example.com/page/">
  <link rel="icon" href="/favicon.svg" type="image/svg+xml">
</head>

Open Graph + Twitter Card

<!-- Open Graph -->
<meta property="og:type" content="article">
<meta property="og:title" content="Page title">
<meta property="og:description" content="Summary for social shares.">
<meta property="og:url" content="https://example.com/page/">
<meta property="og:image" content="https://example.com/og-image.png">
<!-- Twitter -->
<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:title" content="Page title">
<meta name="twitter:description" content="Summary for social shares.">
<meta name="twitter:image" content="https://example.com/og-image.png">

hreflang (multilingual)

<link rel="alternate" hreflang="en" href="https://example.com/">
<link rel="alternate" hreflang="pt-BR" href="https://example.com/pt-br/">
<link rel="alternate" hreflang="es" href="https://example.com/es/">
<link rel="alternate" hreflang="x-default" href="https://example.com/">

JSON-LD — Article + Organization

<script type="application/ld+json">
{
  "@context": "https://schema.org",
  "@type": "Article",
  "headline": "Article title",
  "description": "Short description of the article.",
  "image": "https://example.com/cover.jpg",
  "datePublished": "2026-01-15",
  "dateModified": "2026-01-20",
  "author": { "@type": "Person", "name": "Author Name" },
  "publisher": {
    "@type": "Organization",
    "name": "Your Brand",
    "logo": { "@type": "ImageObject", "url": "https://example.com/logo.png" }
  },
  "mainEntityOfPage": "https://example.com/page/"
}
</script>

robots.txt

User-agent: *
Allow: /

# Block low-value paths (example)
Disallow: /cart/
Disallow: /*?sort=

Sitemap: https://example.com/sitemap.xml

sitemap.xml (with hreflang)

<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
        xmlns:xhtml="http://www.w3.org/1999/xhtml">
  <url>
    <loc>https://example.com/</loc>
    <lastmod>2026-06-25</lastmod>
    <xhtml:link rel="alternate" hreflang="en" href="https://example.com/"/>
    <xhtml:link rel="alternate" hreflang="es" href="https://example.com/es/"/>
    <xhtml:link rel="alternate" hreflang="x-default" href="https://example.com/"/>
  </url>
</urlset>

Crawl, audit & performance

Tool	What it does	Type
Lighthouse	Audits performance, SEO, accessibility & best practices. Built into Chrome DevTools.	OSS
Unlighthouse	Runs Lighthouse across your whole site from the CLI.	OSS
PageSpeed Insights	Core Web Vitals (field + lab) with prioritized fixes.	Free
WebPageTest	Deep waterfall, filmstrip, multi-location performance testing.	Free
web-vitals	JS library to measure LCP/INP/CLS from real users.	OSS
Screaming Frog	Desktop crawler for technical audits (free up to 500 URLs).	Freemium

Search operations & structured data

Tool	What it does	Type
Google Search Console	Indexing, queries, CTR, Core Web Vitals, sitemaps. Essential.	Free
Bing Webmaster Tools	Bing indexing, keyword research, backlinks.	Free
Rich Results Test	Validates structured data & previews rich results.	Free
Schema.org Validator	Checks JSON-LD / Microdata against the vocabulary.	Free

Analytics — open-source & privacy-first

Tool	What it does	Type
Plausible	Lightweight, cookie-free analytics; self-host or cloud.	OSS
Umami	Simple, privacy-friendly analytics; self-host or cloud.	OSS
Matomo	Full-featured GA alternative with on-premise option.	OSS
GoatCounter	Tiny, cookie-free counter; single Go binary.	OSS

Monitoring & extras

Tool	What it does	Type
SerpBear	Self-hosted keyword rank tracking.	OSS
Lychee	Fast broken-link checker (CLI + GitHub Action).	OSS
axe-core	Accessibility engine; a11y overlaps with SEO quality.	OSS
advertools	Python toolkit: crawl, robots.txt, sitemaps, SERP analysis.	OSS

Stack	Library	What it does
React / Next.js	next-seo	Declarative meta tags & JSON-LD for Next.js.
Next.js (App Router)	generateMetadata	Built-in metadata API for static & dynamic SEO.
Astro	astro-seo · @astrojs/sitemap	Meta/OG helpers and automatic sitemap generation.
Vue / Nuxt	@unhead · @nuxtjs/seo	SSR-safe head management; sitemaps, robots, schema.
SvelteKit	<svelte:head>	Built-in per-page head & prerendering for static SEO.
WordPress	Yoast · Rank Math	Full SEO suites: meta, sitemaps, schema, redirects.
Django	django-meta	Meta tags, Open Graph, and Twitter Cards for models.
Ruby on Rails	meta-tags	Meta tags, canonical, robots directives, and OG.
Hugo / Jekyll	Built-in templates	Native meta & sitemap support — no plugin needed.
Node.js	sitemap	Programmatic XML sitemap generation.

Generator / validator	Builds or checks
TechnicalSEO — Schema Generator	JSON-LD for 15+ types (Article, FAQ, LocalBusiness, Product…).
WebCode.tools — Structured Data	JSON-LD & Microdata for common schema types.
OpenGraph.xyz	Open Graph & Twitter Card tags with live preview.
TechnicalSEO — Hreflang	Generate & test hreflang annotations.
TechnicalSEO — Robots.txt	Build & validate robots.txt rules.
XML-Sitemaps.com	Crawl a site and download a sitemap.xml.
Google Rich Results Test	Validate structured data & preview rich results.

Foundations (once per site)

Verify the site in Google Search Console and Bing Webmaster Tools
Publish a sitemap.xml and submit it; add a correct robots.txt
Serve everything over HTTPS; confirm the site is mobile-responsive

On-page (every page)

Unique, 50–60 character title with the primary keyword near the front
Compelling ~155 character meta description
One H1; logical H2/H3 hierarchy
Content that fully matches the search intent
Short, readable URL; descriptive internal links; alt text on images

Technical & performance

Self-referencing canonical; no accidental noindex
Core Web Vitals in the “good” range (LCP ≤ 2.5s, INP ≤ 200ms, CLS ≤ 0.1)
Structured data added and validated with the Rich Results Test
No broken links or redirect chains
Reciprocal hreflang + x-default if multilingual

Ongoing

Review Search Console weekly for coverage & query trends
Refresh and improve existing content; earn relevant links
Monitor Core Web Vitals and fix regressions

SERP: Search Engine Results Page — what you see after searching.
Crawling: Bots discovering and fetching pages by following links and sitemaps.
Indexing: Storing a parsed, rendered page so it can appear in results.
Canonical: The preferred URL among duplicates, declared with rel="canonical".
hreflang: An annotation telling search engines which language/region version to show.
E-E-A-T: Experience, Expertise, Authoritativeness, Trustworthiness — a content-quality lens.
Core Web Vitals: LCP (loading), INP (responsiveness), and CLS (visual stability).
Structured data: Schema.org markup (usually JSON-LD) that explains a page to machines.
Backlink: A link from another site — a signal of authority and trust.
Anchor text: The clickable words of a link; describes the destination.
Organic traffic: Visitors from unpaid search results.
Crawl budget: How many URLs a search engine will crawl on your site in a given time.
GEO: Generative Engine Optimization — optimizing to be cited in AI-generated answers.

Is SEO still worth it in 2026 with AI search?

Yes. AI Overviews and assistants are built on the same crawled, indexed, and ranked web. Strong SEO foundations make your pages eligible to be shown and cited.

How long does SEO take to show results?

Usually three to six months for new content to mature, and longer for competitive terms. SEO compounds over time — it's a long-term investment, not an instant switch.

Do I need to pay for tools to do SEO?

No. You can go a long way with free and open-source tools such as Google Search Console, Bing Webmaster Tools, Lighthouse, and open-source crawlers and analytics. See Tools.

What is the single most important ranking factor?

There isn't one. Relevance, genuinely helpful content, and a technically sound, fast, trustworthy site work together. Be skeptical of anyone selling a silver bullet.

Are meta keywords still used for ranking?

No. Google ignores the meta keywords tag. Focus on title tags, helpful content, internal linking, and structured data instead.

Does structured data improve rankings?

Not directly, but it can earn rich results that improve visibility and click-through, and it helps search engines understand your content.

✍️ Improve content

Fix an error, sharpen an explanation, or add a missing detail. Open a pull request against the relevant section.

🌍 Translate

Help keep English, Portuguese, and Spanish in sync — or propose a new language. Section anchors are identical across versions.

🔧 Suggest tools

Know a great free or open-source SEO tool we missed? Open an issue and tell us what it does.

Star on GitHub ★ Read CONTRIBUTING Open an issue

Released under the MIT License — free to read, share, and adapt.

Google Search Central — SEO Starter GuideGoogle's own introduction to the fundamentals.

Google Search Central — Structured data introHow structured data works and which features it can unlock.

web.dev — Web VitalsThe definitive reference for LCP, INP, and CLS.

Google Search Central — Localized versions & hreflangOfficial guidance for multilingual and multi-regional sites.

Google Search Central — Optimizing for AI featuresHow foundational SEO applies to generative AI search.

Schema.orgThe shared vocabulary for structured data.

Bing Webmaster GuidelinesBing's official best-practice guidelines.

Search Engine Optimization: The Definitive Guide

What is SEO — and how to use this guide

Who it's for

What you'll learn

How it's organized

How search engines work

1. Crawling — discovery

2. Indexing — understanding & storage

3. Ranking — scoring relevance & quality

4. Serving & rendering

Search intent & keyword research

The four types of search intent

How to find keywords (for free)

Evaluate & organize

On-page SEO

Title tag — your most important on-page element

Meta description — your ad copy

Heading hierarchy

Content that matches intent

URLs, internal links & images

Technical SEO

XML sitemaps

robots.txt

Canonical tags

Redirects

HTTPS, mobile-first & architecture

Structured data & rich results

Types worth knowing

Content

Business & commerce

Why it matters

Core Web Vitals & page performance

How to improve each

How to measure

International & multilingual SEO

hreflang in three rules

Which URL structure?

Localize, don't just translate

Off-page SEO & link building

Why links still matter

Earn links the durable way

Anchors & link attributes

Content quality & E-E-A-T

People-first, helpful content

Show who's behind it

Using AI to write

Local SEO

Google Business Profile is the engine

Reviews & reputation

NAP consistency & schema

Image & video SEO

Images

Video

SEO for AI: GEO & AI Overviews

What makes a page citable

Measure & monitor

Google Search Console free · essential

Bing Webmaster Tools free

Analytics — privacy-friendly & open-source

Common mistakes & black-hat to avoid

Common mistakes (fixable)

Black-hat (don't)

Copy-paste SEO snippets

Free & open-source SEO tools

Crawl, audit & performance

Search operations & structured data

Analytics — open-source & privacy-first

Monitoring & extras

SEO libraries by language & framework

Online tag & schema generators

The SEO checklist

Foundations (once per site)

On-page (every page)

Technical & performance

Ongoing

Glossary

Frequently asked questions

Is SEO still worth it in 2026 with AI search?

How long does SEO take to show results?

Do I need to pay for tools to do SEO?