Iphone 11 Hard Reboot. Your iPhone will then reboot back to iOS if it's working normally. If things are still not as they should be.
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To turn your device back on, press and hold the side button (on the right side of your iPhone) until you see the Apple logo. The screen will temporarily go dark as the iPhone shuts down and reboots. Check out how to accomplish hard reset by hardware keys and iOS settings.
This is called a force-restart (or sometimes a hard reset), and should hopefully fix any issues you were having.
At some point you're going to find that it's going However, the way that you do this has changed over the years, and even now there are different ways.
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You could go through your entire use of an iPhone without ever having to restart it, but that's unlikely. The screen will temporarily go dark as the iPhone shuts down and reboots. If things are still not as they should be.