Applies To: Windows 10 (with the Creators Update)
If you have the creators update for Windows 10 then you have a new keyboard shortcut…

Win [Windows Key] + Shift + S

It lets you select an area on your screen, and an image of it is copied to your clipboard. You can then paste it (Ctrl + V) into a document or email.
It’s much like using the Snipping Tool (look in your start menu for “Windows Accessories”), but you don’t have to open the Snipping Tool if you use this shortcut!
Your Welcome
Mike ๐Ÿ™‚
PS this is something I use loads of times a day, usually when I’m showing Tim a screen shot of something I just broke!