I was once that first year compsci student. Hanoi kicked my ass, I had to go recruit help from my smarter friends. Though to be fair the teacher didn’t explain it that well and just sort of threw it at us to see which of us would sink or swim. After we all complained about it he gave us a proper lesson on recursion and it was a little easier after that but I still struggled a lot on that project. We also implemented Conway’s Game of Life that semester and I preferred that project by a lot.
Most F-Droid stuff AFAIK should be pretty plug and play. It’ll download an APK which you then just open in order to install the app. You may need a file browser app if your phone OS doesn’t come with one. You may also need to allow installs from third party somewhere in the settings. But android isn’t like iOS and won’t generally restrict your ability to install whatever you want, outside of an options popup to make sure you know what you’re doing.
I don’t use LibreTube personally and can’t speak on that specifically though, if it does something other than just download you an APK file.