Because I'm dumb, what's the difference between the latest build and the unstabledev build?

latest build is what can be thought of the latest normal version of the game as in its the last version thats not game breaking tier broken potentually unstabledev is where all the newest of the new is added and may or may not work properly

Ah okay, thank you very much!

Thought of a new question, how can I play a modded version of this game