CLAUDE.md and Project Configuration
The single highest-leverage setup step for Claude Code is a good CLAUDE.md — the file where you write down, once, the context and conventions you'd otherwise repeat every session.
The highest-leverage setup step: a good CLAUDE.md that gives durable project context (build/test commands, conventions, gotchas, what not to do), how it layers, and the settings/permissions that tune autonomy safely and shareably.