You'll find a bit of everything, but mostly just bash and maybe some perl.
⚠️ If you don't understand what any script is doing and how, then don't install it, period. You have been warned. Best way to use these scripts is to read them, grab them and put them into your own stuff. For personal scripts only, I've given in and started using the incredibly inefficient and insecure/usr/bin/envshe-bang line convention, which pretty much ensures they will work on most any OS and distro.