THere is a short cut where you hit the down volume button and the home button at the same time to capture screenshots. At least I'm pretty sure that's what it is for iPhones. It is just muscle memory for me at this point.
That Cloud App looks good for recording your screen but an easy way to take just a picture of your screen, in Windows 10 is to hold down the Windows Key then press the PRINT SCREEN key. The screen will flicker and the screenshot will be saved in your Pictures folder in a Subfolder named Screenshots.
It's nice to be important but it's more important to be nice.
The one thing I've found is that when I print screen the image is more spread out so everything looks smaller. I like having the ability to just get a certain portion of the screen and you can set the default window size and location so it's ready to go when you need it.