How to screen shot mac high sierra

How to take a screenshot on your Mac 

(⌘⬆︎3) Command-Shift-3         Capture the screen to a file

(⌘⬆︎⌃3) Command-Shift-Control-3 Capture the screen to the Clipboard

(⌘⬆︎4) Command-Shift-4         Capture a selection to a file

(⌘⬆︎⌃4) Command-Shift-Control-4 Capture a selection to the Clipboard

(⌘⬆︎5) Command-Shift-5         Invoke new screen grabber

Paste the following command in the Terminal window followed by the Return or Enter key to change the type of screenshot file to jpeg:

defaults write com.apple.screencapture type jpg && killall SystemUIServer

Past the following commands in the Terminal window followed by the Return key to change the save location of screenshots to the desktop.

defaults write com.apple.screencapture location ~/Desktop/ 

killall SystemUIServer

Command shift 3

Select your choice of Screenshot shortcut from System Preferences > Keyboard panel > Shortcuts >Screenshots.