You can use
Fn + F1-F12 to control various ascpect of your computer, such as
Fn + F1/F2/F3 to control volume or
Fn + F10/F11 to control brightness.
Strangely, my notebook comes with
Fn not working by default, where
Ctrl key is used instead.
Fn key, you need to enable Function lock (there is a
Fn lock icon on my
Esc key). Press
Fn + Esc once to enable function lock (sadly, there is no visual indicator if
fn lock is enabled or not). Now you can use
Fn + F1-F12 to control your computer.