Almost everybody knows how to enchant, but the cost of enchanting is broken in my opinion. If you have 100 levels and get a level 3 enchantment, then you go down 3 levels. To me it seams a bit dumb, and feels like it should only get rid of the amount of exp it took to get to level 3, and not 3 levels. I don't mind if it changes, but wanted to bring it up. Also I'm playing on 1.15 so I'm not completely sure if they changed it in 1.16.