Use the buttons and screen on your Apple Watch - Apple Support (CA)

Learn how to interact with your Apple Watch using the Digital Crown, side button, and gestures. 

Change the audio and notification settings on your Apple Watch

Use Control Center on Apple Watch - Apple Support

If you see ! - Apple Support

How to use AssistiveTouch on Apple Watch

Use Emergency SOS on your Apple Watch - Apple Support

About Bluetooth, Wi-Fi, and cellular on your Apple Watch - Apple

Status icons and symbols on Apple Watch - Apple Support (CA)

How to use Apple Fitness+ - Apple Support (CA)

Set up your Apple Watch - Apple Support (CA)

Run with your Apple Watch - Apple Support (CA)

Use Control Center on Apple Watch - Apple Support

Use AssistiveTouch on iPhone - Apple Support

Your Apple Watch - Apple Support

Apple Watch Devices and Accessories – Best Buy

Buy Apple Watch Ultra - Apple (CA)

Cambridge Research Systems - 4 Side Button Cylinder

How to Stop Your iPhone's Side Button From Hanging Up a Call

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People are just realizing iPhone lock button has secret function – it's so useful once you find it

How to use the side button for accessibility on iPhone, Accessibility support