The word "Your" is the second person possessive adjective, used to describe ownership and when used correctly, is almost always followed by a noun.
Ex: Your mortgage is too high.
Did you pass your driving test?
You won the marathon in your age group.
The word "Yours" is also the second person but it is a possessive pronoun and it combines the word "your and the noun".
Ex: I found this wallet, is it yours? (I found this wallet, is it your wallet?) The term "yours" combines your and wallet.
I have my passport and here is yours. (I have my passport and here is your passport).
The word "You're" is a contraction for "you" and the verb "are" (you are).
Ex: You're late. (You are late).
You are missing a tooth. (You're missing a tooth).
Do not write "your welcome" or "your right". It should be written "You are welcome" or "you're welcome". Similarly, it is "you are right or you're right".