# Welcome to the source code! 😊

Here, you'll find all of Atlas' modifications in plain text. See our development documentation for more info:

- [Building the Playbook](https://docs.atlasos.net/contributing/playbook/#how-to-build-a-playbook)
- [Testing the Playbook](https://docs.atlasos.net/contributing/playbook/#how-to-run-your-built-playbooks)
- [What to test (for general testing)](https://docs.atlasos.net/contributing/testing/what-to-test/)