The rule of their, there and they’re.

This is a nit picky little grammar thing that bugs me, so I thought I would share a sentence to help people remember which one is correct.

Their stuff is over there and they’re taking it to the beach.

their is the possessive form of “they”.
there is most commonly used as a noun to point out a location, but can also be used as an adverb, adjective, pronoun or interjection.
they’re is a contraction for “they are”.

Just a note for those who are confused.