These are probably some of the most important grammar particles you will ever learn but they will also be some of the trickiest. I mean, they even sound the same!
It boils down to this main difference: 的 is used with nouns and 得 is used with verbs. The last one, 地, is mainly used to modify verbs (like the “ly” in English).
1. Noun + 的 + Noun
Possessive words (my, your, her, his, our, their, etc.) don’t directly translate into one word in Chinese, you add 的 to the end of the pronoun (I – 我) to make it possessive (My – 我＋的). This is definitely one of the easier grammar constructions, one which you should learn very early on in your Chinese studies.
我的书 - wǒ de shū - my book
2. Attribute + 的 + Noun