To remember the correct difference, the apostrophe represents a missing letter (as in the "G" from " Cookin' " and "Goin'") in the case of "You're" it's the missing "A."As for "Your" it means it belongs to someone or something. (Genetive form. In some ways, the possessive form.)After committing these to memory, it gets extremely easy to remember without looking it up. Helpful examples:-"You're" (You are.)"You're next.""That place is heavily guarded , you're not going in there, are you?""You're dead, wait 'till I get my hands on you.""When you're there, turn left .""Your.""This is your car.""Your Majesty .""Let's go to your place.""Is this your's?"Both definitions."You're going to your wedding and that's that!""You're responsible for your mistakes.""That's your pet and you're going to take care of it, not me!"