Tired of fumbling around in the dark? With iOS 14 or later on an iPhone 8 or newer, you can quickly turn on and off your flashlight with two or three taps on the back of your iPhone using a feature called Back Tap. Here’s how to set it up.
How-To Geek
https://www.howtogeek.com/692273/how-to-turn-on-the-flashlight-by-tapping-your-iphones-back/