version control?

It's a whole other rabbit hole, but if you plan to work professionally in software then you can't avoid it. You'll find most places use git via github.com. The basic idea is after you save files, you "commit" them into version control and push them to a remote/backup location (github).

GitHub: Let’s build from here

GitHub is where over 100 million developers shape the future of software, together. Contribute to the open source community, manage your Git repositories, review code like a pro, track bugs and fea...