Your is possessive, while you're is NOT.
You're is just the shortened version of you are.
Your is used like this: "It's your move, dear."
You're is used like this: "You're the one at fault here!"
These are just examples on how to use the two different words.
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Tips On Spelling&Grammar
RandomSo...as the title says, I'm going to write some tips as to the grammar and spelling of words and sentences. I hope you find this useful for writing your essays, stories, etc. :) If you have any questions, go ahead and ask them in the comments.