Screen Capture MAC

I use both Windows and Apple computers and I needed to find the best way to capture an area of the screen on my iMac. I thought I needed something like Cropper which I use in Windows, but have discovered iOS has it built in. Here are the following capture options I have discovered:

1. To capture an area of the desktop, press cmd+shift+4, this will give you a cross hair where you can select and area of the screen, this will save the image as a png file on the desktop.
2. To capture a application screen, press cmd+shift+4, to display the cross hair again, now hit the space bar and the icon will change to a camera and will select areas of the desktop.
3. To capture the whole desktop, press cmd+shift+3.

I thought this was great that Apple has included these features in iOS, I bet I will find some more useful features the more I use iOS.