Explain Git and GitHub to a beginner.

Git is a tool on your computer that records the history of your project as commits (snapshots).
It lets you create branches to try changes safely and merge them later.
GitHub is a website (also GitLab, Bitbucket) that stores a copy of your Git repository online so teams can share it.
On top of Git, GitHub adds pull requests, code review, issues and automation (Actions).
Daily flow: clone, create a branch, edit, add, commit, push, open a pull request.