Claude Code Mastery

What you learn

Lessons · open a part to see them

• 1Start here7 lessons

  1. Introduction

     Course goals, audience from beginner to experienced dev.

  2. Installing & setting up

     Install Claude Code, auth, trust folder, verify with the CLI.

  3. Talking with code

     Explore an open-source codebase with scoped, constrained questions.

  4. Exercise: asking questions

     Three targeted questions about a real codebase at your experience level.

  5. Models, context & usage

     Tokens, 200k/1M context, /clear, Opus/Sonnet/Haiku, effort, /usage.

  6. First coding task

     CSV invoices to PDFs with @filename, permissions, and verification.

  7. Vibe coding vs agentic engineering

     Vibe coding for one-offs; agentic engineering for serious projects.

• 2Project memory6 lessons

  1. CLAUDE.md

     Per-project and .local files, auto-appended, nested per directory.

  2. Building your CLAUDE.md

     /init to seed then trim; merge examples; add project rules.

  3. CLAUDE.md in practice

     Migrate JS to TS with unit tests under new CLAUDE.md rules.

  4. Voice input

     /voice, Super Whisper, Whisper for transcription.

  5. Claude and git

     Git basics with Claude doing the heavy lifting; worktrees introduced.

  6. Using git with Claude

     git init, GitHub SSH, paste docs as markdown, voice-drive git.

• 3Safety & teamwork3 lessons

  1. Tool permissions

     Allow/ask/deny per tool; bash scoping; shared vs .local settings.

  2. What to commit

     Commit CLAUDE.md, shared settings, subagents; ignore .local.

  3. Co-author commits

     Claude as commit co-author; includeCoAuthoredBy; rebase to clean history.

• 4Plan & delegate4 lessons

  1. Plan mode

     Plan first, build after; review and push back before commit.

  2. Using plan mode

     Shift+Tab toggles; auto-accept or review; when planning pays off.

  3. Subagents

     Isolated workers, summaries back to main context; built-in and custom.

  4. Build a review subagent

     Read-only reviewer scoped to uncommitted code; markdown + frontmatter.

• 5Skills, hooks & plugins6 lessons

  1. What is a skill?

     Reusable prompts in .claude/skills/; command or auto trigger.

  2. Build a command skill

     Build a skill with Claude; name, command, restart to load.

  3. Existing skills

     skills.sh marketplace; audit before install.

  4. Using skills in design

     Install via CLI; auto-invocation; frontend-design skill demo.

  5. Hooks

     Non-negotiable rules on Claude Code events; block bad commits.

  6. Plugins

     Bundle skills, hooks, subagents, MCP; install from folder or marketplace.

• 6Permission modes & sandbox5 lessons

  1. Permission modes

     Six modes from default to bypass; Shift+Tab to switch.

  2. Bypass / YOLO

     --dangerously-skip-permissions; prompt injection risk; containers only.

  3. Auto mode

     AI classifier blocks risky bash; respects in-chat rules.

  4. Dontask mode

     Deny by default; allow only via explicit rules; for CI.

  5. Sandboxing

     Filesystem and network wall; blocks compromised packages.

• 7Parallel workflows2 lessons

  1. Git worktrees

     claude -w branch checks out parallel folders; auto-cleanup.

  2. Two agents at once

     Multiple terminals, worktrees, auto mode, orchestrator pattern.

• 8Capstone5 lessons

  1. Capstone: joining a project

     Technical onboarding; settings.json; CLAUDE.md vs agents.md.

  2. Setting up the environment

     Testing setup first; agents.md rules; review plugins and skills.

  3. Setting up hooks

     Stop hook runs unit tests; file-change hook lints changed files.

  4. Build the feature

     Ship missing feature; subagents; tests as hard gate, review as advisory.

  5. ADRs

     docs/adr/ with index; document why for hard-to-reverse decisions.