I use a generic external USB keyboard (specifically Amazon Basics Wired Keyboard) with my MacBook Pro. The keyboard doesn't include the
fn key present on MacBook's built-in keyboard.
On the external keyboard, I wish for F1, F2 etc. keys to function just like built-in keyboards default configuration, i.e. to control Mac features like adjusting brightness, Mission Control, Launchpad etc. and not work as plain function keys.
How do I configure the external keyboard to do that? I would much prefer for a solution built into macOS rather than relying on a 3rd party app.
I am using a late 2013 15" MacBook Pro running macOS High Sierra 10.13.6.