# Phase 0: Setup & Tooling

> Get your environment ready for everything that follows.

## Start this phase on GitHub

**Prerequisites:** None. You need Git and Python 3.11 or newer to begin. Other
tools are installed only when your route needs them.

**First lesson:** [Dev Environment](01-dev-environment/)

From the repository root, run the route-aware preflight:

```bash
python3 phases/00-setup-and-tooling/01-dev-environment/code/verify.py --route beginner
```

Keep the command, repository-root working directory, exit code, required check
results, and the printed `Next:` command. Optional misses are not failures.

**Next action:** Fix every required failure, rerun until the command exits 0,
then continue to [Git and Collaboration](02-git-and-collaboration/).

Browse the [full Phase 0 lesson list](../../README.md#phase-0) or the
[cross-phase roadmap](../../ROADMAP.md).