Using Git
Git is a very powerful version control tool that should be used whether you're just making a server or developing resources. Popular implementations include Github, GitLab and BitBucket - the most common you'll run into is Github as it is the most popular and in my opinion, the best option in most cases.
To learn how to setup Git, you can reference these materials:
There's of course dozens of other ways to learn it, you have access to the entire internet at your finger tips, go do some research!