Your is a possessive pronoun. An example is “your bag is over there.”
You’re is a contraction for “you are.” Hint: if you can’t reasonably use “you are” instead of “you’re” without the sentence sounding wrong, then “you’re” shouldn't be used. An example of this is “you’re getting good at this!” It works because you can also say “you are getting good at this!”
Some bad examples are “you’re dog is so cute,” and “your never going there.”
Source: Owl.english.purdue.edu