This is a really good topic! One thing I'd like to add is "make backups". I've lost a good chunk of old projects because I didn't have them properly backed up over the years, but since I figured out how to use Git it's not happened again for quite some time. And having a Git repo and doing commits regularly can get you out of a lot of trouble in case something goes awry - e.g. if you introduce a breaking change without realizing and now EVERYTHING stopped working. Or if you wanna try something out, realize it didn't work, and want to quickly get rid of it.