1. Introduction
2. 1. How to read this tutorial
   2. Stay up to date
   3. Help make this tutorial better
   4. Terminal basics
3. Level 1
4. 1. Installation and setup
   2. Initializing a repository
   3. Inspecting the state of a repository
   4. Making changes
   5. Creating a new commit
   6. Sending commits to a remote
   7. Updating bookmarks
   8. Cloning a remote
   9. Using GitHub (optional)
5. Level 2
6. 1. Branching history
   2. Inspecting a commit
   3. Creating a merge commit
   4. Excluding files from version control
   5. Rebasing
   6. Adding more bookmarks
   7. Navigating the history
7. Level 3
8. 1. Undoing mistakes
   2. Tracking remote bookmarks
   3. Resolving merge conflicts
   4. Deleting commits and bookmarks
   5. Restoring file contents
9. Must-know secret commands