It is very easy to take a screenshot on the Samsung Galaxy S7. Even You do not need to use or install any additional application on your Samsung phone. You can capture a screenshot on the Galaxy S7 using its Hardware buttons. Or You can do it by (Palm Swipe to Capture) feature.
Find out How to factory reset the Samsung Galaxy S7 using the available methods I listed in this guide. The Samsung Galaxy S7 comes with more than one Model Number like SM-G930A, SM-G930U, SM-G930P, SM-G930T, SM-G930F and many more. But whatever the model number is, You can apply the same steps explained in this guide on all of them.
I divided this guide into several sections. You can read them all starting from the first one. Or just select the section you want to know more about it.