How to screenshot?

Take a screenshot in three ways
You can take a screenshot with the following three ways:
 Press the Volume down button and the Power button simultaneously to    take a screenshot. See How to enable Take a screenshot shortcut for more information.

 Slide three fingers down to take a screenshot. See How to enable Take a screenshot shortcut for more information.
 Swipe down from the status bar to open the Control center and tap  Screenshot to take a screenshot.
 

Enable Take a screenshot shortcut
When you enable the feature, you can slide 3 fingers down on the screen or press the Volume down button and Power button simultaneously to take a screenshot.
1. Go to Settings > Additional settings > Gesture shortcuts > Take a screenshot.
2. Choose to enable take a screenshot shortcut.
 Tap  to enable Slide 3 fingers down.
 Tap  to enable Volume down + Power.