This Claude Code Command is PERFECT for Beginners!

Claude Code's /powerup command ships 10 built-in lessons covering every core feature, but they're read-only demos — not interactive exercises.

## File and line references with @ The first lesson covers referencing files directly in prompts. Instead of pasting a 200-line file, type @src/app.ts to pull in the full file, or @src/app.ts:42-72 to load only lines 42 to 72. The creator calls this the most underrated tip in the video: you're pointing at code, not describing it, which reduces hallucination and token spend.

## Mode cycling with Shift+Tab The second lesson is permission mode switching. Press Shift+Tab to cycle between Plan, Accept Edits, and Bypass Permissions. The creator's default workflow is Plan first, then Accept Edits — and only Bypass Permissions for trivial tasks.

## Two ways to undo Lesson three covers the safety net. Hit Esc Esc to interrupt Claude mid-task. Run /rewind to roll the entire session back to a checkpoint before a specific tool call — for example, after a destructive migration. The mental shift: stop being conservative, let Claude attempt the bigger refactor, and undo if needed.

## Background tasks and the CLAUDE.md bootstrap Lesson four teaches /tasks for monitoring long-running jobs without interrupting Claude. Lesson five is the CLAUDE.md file at the project root — compared to OpenClaw's six separate bootstrap files (.soul.md, agents.md, tools.md, etc.), it's a single markdown file auto-loaded every session. Run /init to have Claude generate one for a new project, and update it daily as the codebase evolves.

## MCP, skills, hooks, sub-agents, and model routing The final five lessons cover /mcp for external tool servers, custom slash-command skills, event-driven hooks, sub-agents spawned in parallel via /agents, /remote-control for phone access, and mid-session model switching. The creator's own stack: Haiku for scraping, Sonnet for research, Opus for synthesis — specifically across 4 parallel scripts in a market intelligence project.