The home button is gone on the Apple iPhone X, so how do you take a screenshot?
It used to be that you press the home key and the power key on the side to take a screenshot, but with no home key, the shortcut has now changed.
To take a screenshot on the Apple iPhone X you need to simply press down the power button on the side and the volume up key simultaneously. Hold them for a second, and you will hear the familiar sound and momentary blink as you take a screenshot.
Press and hold the side button … – Source