Revive your unresponsive iPhone by forcing it to restart. Additionally, you can try charging the phone or reinstalling iOS.
You don't have to stretch out your thumb every time you change your screen brightness or turn on Do Not Disturb.
You can reset an iPhone, even without the password, by putting it into "recovery mode" or erasing it via iCloud's Find My ...
You might not know about all of these iOS settings, but they let you tweak your experience and get the most out of your iPhone.