In fact "的”“地”“得”refer to chinese grammar.I don't know how much have you mastered about the grammar.Have you ever heard adverbial and complement? "verb+得+adjective",here the"adjective" is complement,"adjective+地+verb",here"adjective"is adverbial.So you can see "地"and"德"are the singal of distinguishing of adjective to be as adverbial or complement.
You can just remember the "verb+得+adjective" and "adjective+地+verb",and you can use "地"and"德" correctly.They are fixed collocation,so don't ask why.Maybe i confuse you,i just want to provide some information helpful for you.