You can also do stuffs like gambling, trading, and faucets if you want to. All of those are easy to do but your earnings mostly wouldn't be that much to say that you "earned" Bitcoins.
That would obviously be the case if you earn from faucets or other micro earning ways as you said the earnings wont be enough to be said bitcoins, but if someone has some skills like you to do something then he can sell his services to the community or if someone has a good enough capital he can earn some good profit by trading altcoins with that.