Keyboard shortcuts save time, hassle, and work in virtually every app on PCs and Macs. Here are the most popular (for Macs, use the Apple key instead of Control): 'Ctrl + a' (select all); 'Ctrl + c' (copy); 'Ctrl + v' (paste); 'Ctrl + x' (cut); 'Ctrl + z' (undo last action); 'Ctrl + y' (redo last action); 'Ctrl + w' (close window); 'Ctrl + q' (quit); 'Ctrl + p' (print).

Source : Switched