To turn off your iPad without using the power button, Apple has options in the General Settings menu or Control Center. Siri ...
You can turn off auto-brightness on your iPhone with a few taps, and manually change the phone's brightness in two ways. Here's how to do each.
You can use Siri on your iPad to give commands and ask questions, as long as it's enabled. You can turn it on and customize it in the Settings app.