Claude How-To (luongnv89/claude-howto) is the definitive community learning resource for mastering Claude Code, Anthropic's AI-powered terminal coding assistant. With 22,600+ GitHub stars, 2,700+ forks, and active maintenance tracking Claude Code 2.1+, it has become the most-adopted community guide in the Claude Code ecosystem. The repository structures its curriculum into 10 progressive modules: Slash Commands (user-invoked Markdown shortcuts), Memory (cross-session CLAUDE.md context files), Skills (auto-invoked reusable capabilities), Subagents (specialized agents with isolated contexts for delegation), MCP Protocol (external tool and API integration), Hooks (event-driven automation across 25+ lifecycle events like PreToolUse, PostToolUse, Stop, and Notification), Plugins (bundled feature collections for team distribution), Checkpoints (conversation state snapshots with rewind), Advanced Features (planning mode, extended thinking, background tasks), and CLI Reference (command-line scripting and CI/CD integration). The guide's key insight is compositional learning: it teaches how to wire slash commands, subagents, skills, hooks, and MCP together into automated pipelines — not just isolated features. Mermaid diagrams visualize internal feature workflows, and all templates are production-ready rather than illustrative. The full curriculum spans 11-13 hours structured into beginner (2.5h), intermediate (4.5h), and advanced (4-6h) tiers, with built-in /self-assessment and /lesson-quiz slash commands for self-evaluation. Practical template coverage includes automated code review pipelines, CI/CD orchestration, documentation generation, team onboarding systems, and security audit workflows. The resource is available in English, Vietnamese, and Chinese with offline EPUB support, and the 2,700+ forks suggest teams are using it as a base for their own internal Claude Code configuration repositories.