Comment by cjCamel

From the same link, being able to take a full page screenshot (as in, below the fold) is also very excellent. I notice from the YouTube page description there is a further shortcut:

  1. Open the Command Menu with Command+Shift+P (Mac) or Control+Shift+P (Windows, Linux, Chrome OS).

  2. Start typing "Screenshots" and select "Capture full size screenshots".

I needed this literally yesterday, when I used MS Paint to cut and paste a screen together like a total mug.