Topical Authority
Build semantic coverage that makes Google trust your site as a topical authority in your niche.
The Free SEO / GEO Knowledge Base · 2026 edition
Learn SEO That Actually Works in 2026
From indexation basics to topical authority, entity SEO, and AI Overviews optimization — structured lessons built for real practitioners.
65
Lessons
9
Topics
16
Modules
Free
Forever
Courses
Choose your path
Nine focused topics, organized by subject rather than skill level. Start with whichever one fits your project today.
Fundamentals
Ranking Fundamentals
How Google evaluates pages, entities, and user behavior
View courseTechnical
Technical SEO & Site Structure
Audits, indexation, rendering, and SILO architecture
View courseContent
Content & On-Page SEO
Commercial pages, briefs, and microsemantic writing
View courseEntities
Entities & Topical Authority
EAV model, embeddings, cosine similarity, topical drift
View courseGEO / LLM
GEO & LLM Optimization
AI Overviews, LLM content criteria, JSON-LD for AI
View courseLinks
Link Building
Strategy, budget, anchor maps, vector interlinking
View courseAnalytics
Analytics & Tools
GA4, GSC, Ahrefs, Screaming Frog, project management
View courseStrategy
Growth, Strategy & Trust
Growth tactics, programmatic SEO, E-E-A-T, and trust channels
View courseNiche
SEO by Niche
Industry-specific playbooks: where to start, what to prioritize, and what to watch out for
View course
How it works
Learn it, then put it to work
No account needed to read. Pick a topic, work through short lessons, and test your site with free tools.
1
Pick a topic
Nine courses organized by topic, not by skill level — each module runs from simple to complex.
2
Read practical lessons
Every lesson shows its reading time up front and is built from real practitioner knowledge.
3
Check your own site
Five small tools — no signup and no paid API keys — let you test AI bot access, indexing, entities, speed, and authority.
What you'll master
Practical SEO skills for the AI era
Built from real client work at Synthexeo.
GEO & AI Optimization
Optimize for Google AI Overviews, LLM citations, and generative search results.
Technical SEO
Indexation audits, rendering checks, Core Web Vitals — fix the issues that block your rankings.
Entity SEO
EAV modeling, entity schema markup, and Knowledge Graph optimization for AI-era search.
Link Building
Strategy, budget planning, anchor maps, and vector interlinking with Screaming Frog.
Growth Strategy
Identify growth points at every project stage and build data-driven SEO strategies for clients.
Free tools
All tools
Free SEO & GEO tools
Five small utilities from the knowledge base. No signup, no paid API keys.
AI Bot Access Checker
See exactly which AI crawlers — ChatGPT, Claude, Google's AI Overviews, Perplexity, and more — can and can't read your site.
Open toolIndexNow Submitter
Ping Bing, Yandex, and other IndexNow-participating search engines the moment you publish or update a page.
Open toolWikidata Entity Checker
Check whether a brand, product, or person already exists as a recognized entity in Wikidata.
Open toolCore Web Vitals Checker
Run a live Lighthouse audit on any URL and get a performance score plus LCP, CLS, and INP.
Open toolOpen PageRank Checker
A free, open alternative to Domain Authority — a 0-10 score built from real link-graph data.
Open toolReady to level up your SEO in 2026?
Explore all 9 topics and start with whichever one fits your project today.