Screenshot
or
Ctrl + Alt + WIndow button
To turn Cap Locks on and off
Alt + Search button
To close the app or to reopen it
To close Ctrl + Shift + W
To open last closed app Ctrl + Shift + T
Task manager window
Search + ESC
To see all keyboard shortcuts commands
Ctrl + Alt + /
or
Ctrl + Alt + ?
To lock your Chromebook
Search button + L
Chromebook split screen
Alt + ]
or
Alt + [
Change screen size (resolution)
Shift + Ctrl + Plus button
or
Shift + Ctrl + Minus button
To delete file
Alt + Backspace
There you have it. Let me know in the comment section what are your favorite shortcuts