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You're is the contracted form of You are. This form is used in sentences using "you" as the subject of the sentence with the verb "to be" used as either the helping verb (e.g. You're going ..., You're watching ...) or the principal verb of the sentence.
Your is the possessive pronoun form. This form is used to express that something belongs to "you".
You know you're a hacker when you drop out of school before your English requirement.