How does AC work in 5e for the damage received? [duplicate]

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  • I'm confused about combat; How can I expect to hit anything?

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So I am preparing for my first session, I have been reading the Guidemaster book of 5end and this is my biggest question. If an attack exceeds a damage roll, how much damage does that player receive? For example, if the player has an AC of 11 and receives blows with 13 damage, does that only cause 2 damages to the health of the players? How does it work?