"THERE", "THEIR", and "THEY'RE"

"There" refers to a place. "Their" indicates possession. "They're" is a contraction for "they are." Ex.: There is a beautiful garden. Their house is nearby. They're going for a walk.

"YOUR" and "YOU'RE"

"Your" indicates possession. "You're" is a contraction for "you are." Ex.: Is this your umbrella? You're a wonderful person.