Quick Lesson just to help:
Your - second-person possessive pronoun - Your watch has the wrong time.
You're (You are) - contraction - You're going to miss the bus.
Their - third-person plural possessive pronoun - Their meal came ten minutes late.
There - adverb (or sometimes exclamation) - There was a web on the ground. (exclamation: There, I told you it really was magic.)
They're (They are) - contraction - They're looking for a new house overlooking a lake.
Happy posting.