Start here. These are straight from the source.
| Resource | What It Is |
|---|
| Prompt Engineering Best Practices | Official guide for Claude Opus 4.6, Sonnet 4.6, Haiku 4.5. XML tags, extended thinking, examples. |
| Interactive Prompt Engineering Tutorial | 9 chapters + exercises. The best hands-on prompt engineering course. |
| Anthropic Courses | Full curriculum including the interactive tutorial and advanced content. |
| Claude Cookbooks | Notebooks/recipes for prompt caching, RAG, tool use, and other patterns. |
| Anthropic Academy | Official learning portal: tutorials, prompt generator, documentation. |
| Claude Code Documentation | Full CLI reference: skills, memory, hooks, MCP, plan mode. |
| How Anthropic Teams Use Claude Code | Internal practices PDF — how Anthropic’s own teams work with Claude Code. |
| Claude System Prompts | Published system prompts for all Claude models. Study these. |
Everything Anthropic puts out, organized by channel.
| Channel | URL | Content |
|---|
| News / Blog | anthropic.com/news | Product announcements, partnerships, policy |
| Research | anthropic.com/research | Research papers, technical reports, economic studies |
| Engineering Blog | anthropic.com/engineering | Engineering deep-dives, how things are built |
| Alignment Science | alignment.anthropic.com | AI safety, alignment research, constitutional classifiers |
| Transformer Circuits | transformer-circuits.pub | Mechanistic interpretability research |
| Frontier Red Team | red.anthropic.com | Security, biosecurity, autonomous systems risk analysis |
| GitHub | github.com/anthropics | 73+ open-source repos, SDKs, tools, examples |
| Resource | Author | Why It Matters |
|---|
| Simon Willison’s Weblog | Simon Willison | Most prolific practical AI blogger. Covers Claude Code extensively, writes clear explanations. |
| ”How I Use LLMs to Help Me Write Code” | Simon Willison | Essential read on practical LLM-assisted development workflow. |
| ClaudeLog | Community | Claude Code docs, guides, tutorials, and best practices aggregator. |
| One Useful Thing | Ethan Mollick | Research-backed practical AI analysis (also a newsletter — subscribe). |
| Channel | Focus | Best For |
|---|
| The AI Advantage (Igor Pogany) | Applied AI workflows, automations | No-fluff practical tool tutorials |
| Skill Leap AI | Tool comparisons (GPT vs Claude vs Gemini) | Understanding which tool for which job |
| How I AI (Claire Vo) | Real professional workflows | Seeing how others integrate AI daily |
| DeepLearning.AI (Andrew Ng) | Courses, technical foundations | Structured learning path |