How to take a screenshot on the Samsung Galaxy S6 / S6 edge

So how do you take a screenshot on the Galaxy S6 and S6 edge?
Luckily, it's all very simple: just simultaneously press the big round home key up front and the power/lock key on the side. You'll hear a short click, and then a zippy animation will show the screengrab flying off the display. The screenshot will then appear in your notification dropdown and it will be automatically saved into the gallery app where you can see it, edit it, and share it. It's all as simple as that!
Things that are NOT allowed: