Primary sources.
No noise.
Official documentation, free courses, and reference materials from Google, Mozilla, OpenAI, Anthropic, and the major SEO platforms. No individual blogs. No affiliate content. Just the sources that don't age badly.
Google — Official Documentation
Straight from the source
Everything Google publishes about how Search works, what it rewards, and what it penalises. These are the primary sources I read before anything else — because everything else is someone's interpretation of these.
The complete official reference for how Google Search works — crawling, indexing, ranking, structured data, Core Web Vitals, and more.
"This is the spec. Read it once cover to cover, then revisit whenever you hear a claim about how Google works — most will fail here."
Google's own introduction to SEO for website owners. The canonical starting point for anyone new to the field.
"Still the best introduction to SEO that exists, precisely because it's from the horse's mouth. Start here, not with a course."
Google's official best practices for appearing in AI Overviews, AI Mode, and generative search features on Google Search.
"The only authoritative source for AIO optimisation. Published 2025 — everything written before this is speculation."
The full guidelines used by Google's human quality raters to evaluate search results. 170+ pages of how Google defines quality.
"E-E-A-T, YMYL, content quality signals — all defined here in detail. Not a ranking guide, but an essential window into Google's quality model."
Official announcements from Google's Search team — algorithm updates, new features, policy changes, and guidance for webmasters.
"I read every post the day it drops. If something changes, it gets announced here before it gets explained anywhere else."
Google / web.dev
Complete technical reference for LCP, CLS, INP — the three Core Web Vitals metrics Google uses as ranking signals.
"Go here before reading any "CWV guide" from a tool vendor. The definitions, thresholds, and measurement methods are all here."
Complete guide to implementing schema markup for Google Search — all supported types, required properties, and testing guidance.
"The only schema reference that matters for SEO. Schema.org tells you what's valid; this tells you what Google actually uses."
Google's official position on AI-generated content — what's acceptable, what constitutes spam, and how quality raters evaluate it.
"Read this before publishing any AI-generated content at scale. The 'scaled content abuse' policy is clearly defined and actively enforced."
Google — Video & Courses
Learning from Google directly
Google publishes more free, high-quality SEO education than most paid platforms. These are the official channels and course programmes I recommend to every client and collaborator.
Google's official SEO YouTube channel — tutorials, Q&As, podcast episodes, and direct answers from Google Search advocates.
"700,000+ subscribers. The #AskGooglebot series alone is worth a full afternoon. I watch every new upload within 48 hours."
Google's official training platform for Google Ads, Google Analytics 4, Google Marketing Platform, Search Console, and more. Includes graded certifications.
"The GA4 certification here is the only one I recommend for analytics. Built by Google product experts — not a third-party interpretation."
Google / Chrome
Structured courses on CSS, HTML, JavaScript, performance, accessibility, Core Web Vitals, and progressive web apps — written by Chrome engineers.
"The performance and Core Web Vitals modules here are the best free deep-dives available anywhere. I send every developer I work with to these."
The official Google Search podcast hosted by Search Relations engineers — candid conversations about how Google Search actually works.
"More honest than any blog post. The team talks about how they think about things, not just what's officially documented."
Free digital marketing fundamentals course from Google, covering SEO, analytics, social, and e-commerce. Includes an IAB-accredited certificate.
"The best free starting point for anyone new to digital marketing as a whole. Structured, credentialled, and genuinely comprehensive."
Web Standards & Specifications
What the web is actually built on
Technical SEO requires understanding how browsers, HTML, and the web platform work at a specification level. These are the canonical references — not tutorials, not guides, but the actual specs.
Mozilla
The authoritative reference for HTML, CSS, JavaScript, and Web APIs — maintained by Mozilla and cross-browser contributors.
"Wikipedia for the web platform. I have it open every single day. Anything a browser can do, MDN documents it."
Schema.org Consortium (Google, Microsoft, Yahoo, Yandex)
The official vocabulary for structured data markup — all types, all properties, all expected values, maintained by the major search engines together.
"The spec I read before implementing any schema type. Not a tutorial, not a guide — the actual thing. Property definitions here are the ground truth."
W3C
Official accessibility standards for web content — directly referenced by Google as a quality signal and increasingly relevant for AI visibility.
"Accessibility and SEO overlap more than most people realise. WCAG compliance correlates with content that AI systems can parse and cite."
HTTP Archive
Annual report on the state of the web — real crawl data from millions of sites covering performance, SEO, accessibility, and technology adoption.
"The best annual benchmark for what the real web looks like. I use it to put client audit findings in context: "your LCP is in the bottom 20% of the web.""
IETF
The official internet standards documents — including HTTP, HTTPS, redirects, status codes, and everything that governs how the web communicates.
"I go here when a client asks why a specific HTTP status code matters for SEO. The answer is always in the spec."
SEO Tool Academies & Official Training
Learning from the tools that power the work
The major SEO platforms all run free academies. These are graded, certified, and updated as the tools evolve. I include these because they teach real workflows — not theory.
Semrush
Free courses and certifications on SEO, content marketing, PPC, and AI Visibility — including the AI Visibility Essentials course and a course by Brian Dean.
"The AI Visibility Essentials course is the most practical introduction to GEO I've found anywhere. Free, certified, and genuinely current."
Ahrefs
Free SEO training from the Ahrefs team — courses on SEO fundamentals, link building, keyword research, and technical SEO.
"Tool-focused but high quality. The 'Blogging for Business' course taught more about content strategy than most expensive courses I've seen."
HubSpot
120+ free courses and 12+ certifications covering SEO, content marketing, inbound marketing, email, CRM, and growth strategy.
"The Content Marketing and SEO certifications here are the most complete free credentials in the space. Stack them with Google Skillshop's GA4 cert."
Screaming Frog
Official tutorials, guides, and documentation for the Screaming Frog SEO Spider — the industry-standard site crawling tool.
"Screaming Frog's own documentation is the best resource for learning the tool. The custom extraction guides alone save hours on every audit."
Official Google Analytics 4 documentation — setup, configuration, reports, events, conversions, and integrations.
"Before asking any GA4 question anywhere else, search here. The answer is almost always here and more accurate than third-party guides."
Official documentation for Google Search Console — every report, every feature, and every status message explained by Google.
"When a GSC report shows something unexpected, this is the first place I go — before any SEO blog, before any forum."
AI Platforms — Official Documentation
Understanding how AI search thinks
To optimise for AI search engines and LLMs, you have to understand how they work from the source. These are the official research blogs, developer docs, and model documentation published by the AI labs themselves.
Google DeepMind
Google DeepMind's official research publications — the foundational AI research behind Google Search, Gemini, and AI Overviews.
"Understanding the research helps me explain to clients why AI systems cite what they cite. The RAG and grounding papers are particularly relevant for GEO."
Official developer documentation for Gemini models, the Gemini API, and Google's AI products — including how Gemini processes and retrieves content.
"Understanding how Gemini retrieves and ranks content is directly applicable to AIO strategy. This is the primary source."
OpenAI
OpenAI's official developer documentation covering GPT models, the API, retrieval, embeddings, and how ChatGPT's web browsing works.
"If you want to understand why ChatGPT cites certain content and ignores others, start here. The retrieval and grounding docs are essential reading."
Anthropic
Official documentation for Claude models — capabilities, context windows, how Claude retrieves and processes information, and API reference.
"As Claude becomes a more prominent search surface, understanding its retrieval logic is increasingly relevant for GEO strategy."
Perplexity AI
Official Perplexity blog — product updates, how their citation and retrieval systems work, and how they evaluate source quality.
"Perplexity is the most citation-transparent AI search engine. Their posts on source selection directly inform how I advise clients on GEO."
Microsoft
Official Microsoft blog for webmasters covering Bing indexing, Copilot integration, and how content appears in Microsoft's AI search products.
"Bing powers Copilot, which has significant B2B reach. Copilot's citation logic follows Bing's indexing — so Bing guidelines apply to Copilot visibility."
Web Performance — Official Resources
The technical foundation of every ranking signal
Performance is not just a UX concern — it is directly tied to Core Web Vitals, crawl budget, and AI visibility eligibility. These are the official resources I reference for every performance audit.
Google / Chrome
Google's official platform for web performance, accessibility, and best practices — written by Chrome engineers and updated with every major standard change.
"The Core Web Vitals deep-dives here are better than most paid courses. I read the 'Optimize LCP' guide with every client before touching their site."
Google Chrome
Official blog from the Chrome team — new browser capabilities, performance improvements, DevTools updates, and web platform changes.
"Anything that changes how Chrome renders pages affects how Googlebot crawls them. I watch this channel closely for rendering-relevant updates."
Official documentation for the PageSpeed Insights API and tool — how scores are calculated, what CrUX data is used, and how to interpret results.
"Before explaining a PSI score to a client, read how it's calculated. The difference between lab data and field data matters enormously."
Google Chrome
Official documentation for Google Lighthouse — the auditing engine behind PageSpeed Insights, with full methodology and scoring explanations.
"Understanding how each Lighthouse metric is measured prevents misinterpreting scores. The methodology docs changed how I diagnose LCP issues."
Developer Reference
The technical stack behind the work
Technical SEO is code-adjacent. These are the official developer references I reach for when implementing fixes, writing schema, or debugging rendering issues.
Mozilla
Complete reference for HTML, CSS, JavaScript, Web APIs, HTTP, and the web platform — the most comprehensive and accurate web technology documentation available.
"I have this open every single working day. If it involves a browser, it's documented here more accurately than anywhere else."
Python Software Foundation
Official Python 3 language reference and standard library documentation — the authoritative source for every Python module and built-in function.
"I write Python scripts for log analysis, crawl data processing, and GSC API automation. The stdlib docs save me from reinventing things that already exist."
Git
Official Git reference — the Pro Git book (free online), man pages, and all commands documented by the Git project itself.
"Everything I write for a client goes into version control. Understanding Git properly is non-negotiable for any technical practitioner."
GitHub / Microsoft
Official GitHub documentation — repositories, Actions, pull requests, code review workflows, and GitHub Pages.
"I host client spec docs and audit deliverables in GitHub repos. The Docs cover everything needed to manage those workflows properly."
The Linux man-pages Project
Official Linux manual pages — every command, system call, and library function documented at the spec level.
"Any time I use a Linux command I don't know perfectly, I go here first. Faster and more accurate than Stack Overflow for core Unix tools."
Official Communities & Support
Where real questions get real answers
Moderated, company-operated communities where you can ask questions and get answers from people who work on the products — not anonymous speculation.
Google's official webmaster help community — moderated by Google and by Google Product Experts who are vetted for accuracy.
"The only SEO forum where answers are quality-checked by Google. Google Product Experts here are not random strangers — they're vetted."
Google Chrome
Official community for web developers building with Chrome APIs, DevTools, and web platform features — with direct access to Chrome engineers.
"Performance and rendering questions get answered here by the people who actually built the tools. Worth bookmarking for deep technical issues."
Stack Exchange
The world's largest developer Q&A platform — covering programming, scripting, APIs, and web development with millions of answered questions.
"I list SEO and web development questions here myself. The quality varies but the signal-to-noise ratio is better than any forum — answers get voted."
How I curate this
Primary sources first
Every resource here is published by the organisation that owns the product or standard. No individual blogs, no third-party interpretations.
Free where possible
Almost everything here costs nothing. The best SEO and web development education on the planet is free and published by Google, Mozilla, and the AI labs.
Maintained and current
Official documentation gets updated when products change. Blog posts from 2022 about GA4 do not. I trust what the companies keep current.
Certification where it matters
Certifications from Google Skillshop, Semrush Academy, and HubSpot are graded and recognised in hiring. I list only the ones with signal-value.
Resources teach.
Strategy wins.
The documentation tells you what's possible. Knowing what to apply to your site, in what order, and why — that's a different discipline. That's what I do.