There, their and they're
There refers to a location. Clue 'here' or 'there.' This word has 'here' in it to remember it is for location. There is the store!
Their refers to something that belongs to someone. Clues 'he, i' appear in this word. He and I are people so this their refers to people. Their house is in the middle of the block.
They're is a contraction. Clue: Break this word into 'they and are.' Try using 'they are' in the sentence to see if you can also use they're. They are here! They're here!