Git is a good tool.

Counterintuitively, I won't write too much about this tool. It was simply too quick to install and start using, enough to deserve a very deep recommendation from me. No hassle, just install, go to the source code dir, and 'init', 'add' and 'commit'. Then code, 'add' and 'commit'; rinse and repeat as needed. Good tools harness good development into better performance.