Shorcut for Mac OS

I am listing here all the shortcuts that can be handy for new mac users - 

Command + A - Select all the contents
Command + C - Copy the selected contents
Command + V - Paste the copied contents

Command + Shift + 3 - Screenshot of the full screen and save the image on the desktop
Command + Shift + 4 - Allows the screen to be selected for screenshot and save the image on the desktop
Command+Control+Shift+3 - Screenshot of the fullscreen and copies to clipboard
Command+Control+Shift+4 - Allows the screen to be selected for screenshot and copies the image to clipboard