Your First Pipeline (GitHub Actions)

What a GitHub Actions workflow actually is - events trigger jobs made of steps that run on a runner - then a real ci.yml decoded line by line, plus caching, matrices, secrets, and required checks.

1. The Anatomy of a Workflow The mental model behind GitHub Actions: an event triggers a workflow, which is made of jobs, which are made of steps, all running on a fresh machine called a runner - and how the YAML maps onto each of those words.
2. Building It Up A real .github/workflows/ci.yml that checks out your code, sets up the language, installs dependencies, and runs tests - every line explained, with a green run log and a failing one so you can read both.
3. Beyond the Basics Make CI fast and trustworthy: cache dependencies so installs aren't re-downloaded every run, use a matrix to test multiple versions at once, handle secrets safely, and require checks to pass before a merge.