Mac Screenshots

I've known for awhile that Shift-Command-4 lets me take a screenshot of a portion of my Mac's display and save it as a PNG file on my desktop.  What I just learned was by adding Control to that sequence places the image in the clipboard, a very useful place to have it, for example, adding it to an email.  And on top of that I learned that Shift-Command-4 followed by a space brings up a little camera icon that will screenshot an entire window.  There's even more at this Apple support link.

https://support.apple.com/en-us/HT201361