To take a screenshot with your Samsung Phone:
"Sweep" from left-to-right across the screen with the side of your hand.
If you nail it, you'll hear the same camera shutter sound that's made when you're taking a photo and a "pic" icon will appear on the Notifications bar.
- To access and share your screenshots <tap> on the icon in the Notifications bar, or go to the Gallery.
* Procedure tested and confirmed on Samsung S4, S5, and S6 with Android v5 or higher.