I’m new to black jack and have a question about the rules…

Let’s say the dealer gets an A♠️ and a 5♥️, does the dealer choose whether it’s a 1 or 11 or is there an automatic thing they have to choose, and if then they got a 5♣️ can they change what the ace is worth and get a 21 even if they originally chose the ace to be a 1? Sry if this is a bit confusing, if someone could explain how it works in the comments I’d be grateful ?

Edit: Thanks for the info everyone!

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