Literally, tomes have been written on version control. Nevertheless, I will start by sharing a brief explanation and other introductory content to whet your appetite for further study. Version control (not to be confused with version history) is basically a way for people to collaborate in their own environments on a single project, with a single main source of truth (often called the “master” branch). I’ll go over today is the bare minimum you’ll need to know in order to download a project, make a change, and then send it to master.

https://www.smashingmagazine.com/2020/03/designers-code-git-hmtl-css-engineering-principles/