The Apple Watch borrows a lot from the iPhone, but the biggest difference between them is down to the extra buttons. They each do different things whether you click, double-click or hold them down.
10 Things the Digital Crown and Side Button Do on Apple Watch
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Make purchases with Apple Watch - Apple Support
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Apple Watch Ultra 2 - Gestures & Motion - AT&T
Change the watch face on your Apple Watch Ultra - Apple Support
How to swipe to change Apple Watch faces on watchOS 10 - The Mac
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