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Tools

Everything that helps you learn

The sandbox, references, drills and helpers for Claude Code, in one place. All free, and everything except the GitHub practice runs right in your browser.

Terminal

Try commands without risk and find out what they do.

SandboxA terminal right in your browser: type any command, you can’t break anythingExplain a commandPaste a command and get every part of it explainedCommand referenceEvery command from the courses, with examples and lessonsGlossaryTerms in plain words, from “folder” to “hook”

Claude Code

For when you already work with Claude Code and want to do it with confidence.

Which AI coding tool?A picker of up to four questions, then Claude Code, Codex, Gemini CLI, Cursor, Copilot and more side by sideCheat sheetWhat to reach for when: a skill, a hook, a subagent, MCP, a pluginSettings builderTick boxes, get a ready settings.json with every line explainedCLAUDE.md checkerWhat in your instructions is vague, stale or unnecessaryFeature mapWhat is stable, what is in beta, and who has access

Practice

Lock in what you’ve learned so it doesn’t fade.

ChallengesTasks without hints, built on real scenariosMemory drillsQuick cards on commands and termsReviewSpaced repetition of the lessons you’ve finishedMistake logThe questions you got wrong, ready for another tryExamFinal questions across the levels you have completedPro course examScenario questions on Claude Code at a pro level

Practice on GitHub

The real Claude Code in your own terminal. You need access to Claude.

Claude Code practicum14 tasks on a real project, checked by npm run check. Opens in Codespaces; the completion code earns a badge on the Pro course pageclaude-kitA plugin marketplace for Claude Code: en-kit skills and a reviewer agent, the en-guard hook, en-notify