Learn how to take a screenshot on an iPhone 6, 7, 8, and X using the physical phone keys as well as how to take a screenshot using iOS / software only.
On an iPhone 6, 7, and 8, tap the home and power button simultaneously to take a screenshot.
On the iPhone X, press the power button and the volume up button at the same time to take a screenshot.
To take a screenshot using iOS / software only, click on Settings, General, Accessibility, AssistiveTouch, Turn On, click customize top level menu, click custom, click screenshot. Next, click on the home button on the screen and then click on screenshot.