Choose Node, Python, or Docker and set your branch and version, and the tool generates a ready-to-commit .github/workflows YAML file with the matching install, build, and test steps.
Yes, once the YAML is saved to .github/workflows/ in your repository, GitHub Actions picks it up and runs it on the triggers you configured.
Yes, as a starting point — review names, paths, and details against your actual project before committing.
No. Everything is built client-side in your browser; nothing is sent anywhere until you commit it yourself.