I found this great github project. It’s just a list of .gitignore files for various languages and platforms, but it’s nice to have them all in one place. The .gitignore file is, like it sounds, a list of files or directories that you don’t want to be included in version control. For Android, for example, the bin/ and gen/ directories are generated each time you compile, so you don’t want to include that. Especially, as I learned, because it will give you errors when you run a project created on one computer, on a different computer. The Android .gitignore from github unfortunately didn’t have bin/ or gen/ (or local.properties) in there, so I put them in and was about to send them a pull request, when I found someone else had made the same changes a few days ago already. Which makes me feel better that I was on the right path. Go Open Source!