2. A city of ancient Sumer in southern Mesopotamia on a site in present-day southeast Iraq. One of the oldest cities in Mesopotamia, it was an important center of Sumerian culture after c. 3000 b.c. and the birthplace of Abraham. The city declined after the sixth century B.C.
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.)
"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."
"This is your car."
"Let's go to your place."
"Is this your's?"
"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!"