My notes:

Github tutorial:

Reposatory (Project)

[should be initialized with a readme to discribe the project]

Branch (different versions/coppys than "master" repsitory)

* main branch is called "master"
* new branch is called "feature" (used to test new features)

Commit (saved changes to GitHub-file)

should have a associated "commit message" which describes the change (others should understand it)

Pull Request (compare commited code to other code)

* proposal to someone to review and pull your change into there branch
* the pull request can differenciat (diffs) from both branches
* changes/additions/subtractions shown in green and red

[if features are sucessfull they will be added to the master branch]