Getting started

Lessons in this group, roughly in build order:

• what-is-claude-code — Claude Code is Anthropic’s agentic coding tool that runs in your terminal, reads and edits files in your…
• installation-setup — Installing Claude Code means putting the claude CLI on your PATH, authenticating once, and running it from…
• authentication-api-keys — Authentication tells Claude Code whose account to bill and which provider to call — a Claude subscription,…
• first-session-repl-basics — A Claude Code session is an interactive REPL in your terminal where you type natural-language requests,…
• choosing-a-model — Claude Code lets you pick which Claude model handles a session — trading raw capability against speed and…
• pricing-token-usage — Claude Code bills by tokens — input plus output — so cost tracks how much context the model reads and how…