If you really just want a minimal source control system, Git does the trick well enough. I don't think you need anything more than 'git init' (make a fresh project), 'git commit -a' (commit all new changes except for deleted or renamed files), 'git add' (to add new files), 'git rm' (to remove files), 'git checkout' (for reverting changes), 'git log' (obvious), and 'git diff' (also hopefully obvious). Put a .gitignore file in the root of your project listing globbed filenames for everything you don't want to manage. Run 'git commit' after every sequence of 'git add' or 'git rm' invocations. That's it. You shouldn't need any more documentation than this paragraph.

Branching is a killer feature, as is clean history management, as is the index, and when you find yourself wishing more control over what happens to your source code, wishing for freedom to experiment, all these tools will be there waiting for you.