The 3 in-game tutorials and the Settings page already have a lot of meat in them, but there are probably more functions out there that aren't documented yet. I'll try to list everything I discovered here; if you know anything that isn't here yet please leave a comment and I'll put them here. This guide won't list functions already present in the Settings page because you can already view them from inside the game handily.

Functions that aren't described in the tutorials or settings will be written in bold.