1. Record your phone's screen.
This is not new to the iPhone X, but it works great on this phone.
Traverse to Settings > Control Centre > Customise Controls and add Screen Recording. Next Swipe from the bottom to how the Control Center. Tap the Screen Recording button, and it will begin a count down from three seconds before recording your phone's display. To stop recording, tap the red status bar at the top of your screen and then tap Stop.