Using your finger to navigate the Apple Watch screen can be a little tricky at times, mostly because you’re covering the screen you’re trying to see. So the Apple Watch features the Digital Crown along the side. But it has a few more uses than just allowing you to scroll through text or zoom in on pictures.
A light push of the digital crown when you’re looking at your watch face will bring you to your apps.
If you’re running an app, a push of the digital crown will allow you to exit the app and return to the apps screen.
Holding down the digital crown will activate Siri.
A quick double push of the digital crown will relaunch the last app you were using.