Run /init in any project directory and Claude Code will scan your codebase and generate a CLAUDE.md file. This file is how you give Claude standing instructions: preferred code style, which files to avoid, how tests are run, naming conventions.
Claude reads CLAUDE.md automatically at the start of every session in that directory. Without it, you'll repeat the same context every time. With it, Claude knows your conventions from the first message. I'll be direct: run /init before anything else when you start on a new project.