Thank you for letting me know. Tooltips exist for few things right now but I think that I will remove them in the future simply because I want to port the game to android and tooltips aren't really suited for mobile UX. With that in mind I will probably create a very short text guide for things that I'm unable to explain through UI. Since the core mechanics are still not complete (for example: I don't know if I want to keep Focus stat), I'm postponing those changes.