Alt + Tab = Switch between opens programImage Credit – Wikimedia
Computer shortcuts keys
Ctrl + A
Select All (Click your mouse somewhere in the computer and hit Ctrl + A to select all)
Ctrl + X
Cut selected items.
Ctrl + C
Copy selected items.
Ctrl + V
Paste selected items.
Ctrl + Shift + Esc
Window task manager (If in case your computer is not responding or hang, use this functionality to access the task manager where you can delete the application that causing trouble.)