Welcome, julia.rolim.
In addition, the present tense is used to express a truth or fact; e.g.,
You win! That's a fact, right?
Won, the past tense form, is used to talk about the past; e.g.,
the game is over, and y
ou won!
Both of these
You win! and
You won! are perfectly acceptable. The first one expresses a fact, the second one tells us the game is over.
Does that help?