If you are fan of Ubuntu, i am going to tell you few important shortcuts that i think you should know. But remember that i am not very good at explaining things. So try to use these shortcuts at the same time to understand it better.

1. Ctrl+alt+t => this open terminal.
2. Super + l or Ctrl+alt+l => lock the desktop.
3. Ctrl + d => to go to the desktop.
4. Super+a => to open application menu.
5. Super+m => toggle notification tray.
6. Ctrl+q or Ctrl+w => to close application window.
7. alt+F4 => to close terminal because Ctrl+w will not work there.
8. Ctrl+Alt+Arrow => mover between work spaces.
9. Ctrl+alt+Del => To log out.
10. Ctrl+alt+shift+r => Video capture desktop
11. Super+h => hide window also know as minimise window.
12. Super+F10 => Access Application menu.
    IMPORTANT => If by pressing F3 volume is increasing and you are unable to press F3. Just press fn key and at the same time press f3 key. It will work just fine.