Search Engine Optimization (SEO) is the practice of improving website visibility and rankings in organic search engine results, primarily Google. It encompasses technical implementation, content strategy, and authority-building to help search engines understand, crawl, index, and rank web pages. In 2026, SEO has evolved into a multi-surface discipline spanning AI-powered answer engines, generative search, voice assistants, social search, and agentic AI — making Generative Engine Optimization (GEO), structured data, topical authority, and E-E-A-T (Experience, Expertise, Authoritativeness, Trustworthiness) more critical than ever. A key mental model: search engines and AI models reward content that best satisfies user intent with demonstrated authority — with ~65% of Google searches now ending without a click, visibility increasingly means being cited by AI, not just ranking in blue links.
What This Cheat Sheet Covers
This topic spans 15 focused tables and 191 indexed concepts. Below is a complete table-by-table outline of this topic, spanning foundational concepts through advanced details.
Table 1: Keyword Research & Intent
Everything in SEO starts with understanding what people actually type and why they type it. The strategies here move from the foundational idea of search intent — the difference between someone learning, comparing, and ready to buy — to the practical work of finding long-tail opportunities, clustering related terms into topic hubs, and spotting gaps your competitors haven't filled. Match the right content to the right intent and the rest of SEO gets dramatically easier.
| Strategy | Example | Description |
|---|---|---|
Informational: how to tie a tieTransactional: buy nike running shoes | Four primary intents: informational (learning), navigational (finding a site), commercial (researching), transactional (purchasing) — match content type to intent | |
best waterproof hiking boots for winter | • 3+ word phrases with lower search volume but higher conversion rates • target specific user intent and are easier to rank for than broad terms | |
Cluster: coffee maker + best coffee machines + coffee brewing guide | • Group related keywords by search intent and topic to create comprehensive content hubs • improves topical authority | |
<h1>Guide to Keyword Research</h1> (within first 100 words) | • Include target keyword in title, H1, first paragraph, and URL • signals topical relevance without keyword stuffing | |
What is SEO? → feature in SERPs | • Google feature showing related questions • optimize content to answer these for featured snippet and AI Overview opportunities | |
Low: vegan recipes for beginnersHigh: best laptop 2026 | • Metric (0–100) estimating ranking competition • low-difficulty keywords offer quicker wins • high-difficulty require strong domain authority | |
Two pages targeting email marketing tools | • Multiple pages competing for same keyword • consolidate or differentiate content to avoid diluting ranking signals |