We use a git repository to host our code, and manage the different versions. Ultimately, git is a great tool for software development with a lot of functionality to track changes, branch or merge different files, and the ability to quickly clone files from a server to a local computer to work on.
It's just as easy as all the other programs so far. Simply type
sudo apt install gitBefore you do anything else, you should probably complete the github tutorial. It takes about 15 minutes, but 15 minutes now is totally worth saving hours over messing up the git repo later.
Obviously, there's a lot more to learn about git, but there are actually a lot of great resources online that you should look at first. It would be redundant to put all that information here. Git itself has really good documentation that would teach you everything you could ever want to know about using git, and whatever isn't there, or isn't clear, is probably on some question on stackoverflow.com