Five things, one click each

Claude, explained.

Everything from the walkthrough in one place — the notes, a quick quiz, and five short interactive pieces. Start with the notes, test yourself, or click straight into a single concept.

Read The notes Every key concept, distilled — each with an animation that shows it in motion. Test yourself The quiz Eight quick questions — wrong answers explain themselves on the spot.

Or walk the five interactive pieces

01
The three Claude models
Opus, Sonnet, Haiku — three sizes that trade depth for speed. Pick the right one for the job.
02
What Claude Code & Cowork are
Claude that does the work on your computer, not just chats about it. Two front doors, one engine.
03
Sandboxing & the iCloud break
A sealed Linux box that only sees what you hand it — and exactly why iCloud files fall apart inside it.
04
Context & caching
A fixed-size working memory. Everything Claude reads fills it — and caching saves re-reading the same things.
05
Git & GitHub
A perfect history you can rewind, and a shared online home both Macs sync through. The better foundation.
click / → advance ← back N toggle your notes Built for the Matthew walkthrough · 2026