Can I use the function keys on my magical keyboard

There is no row of dedicated function keys on the Magic Keyboard. But there are loads of CMD options one can use. Some can be programmed in settings. Some can be easily accessed simply by holding the CMD key in any application and a box will open with the options which are available.

Here is a great tutorial on programming functions on the Magic Keyboard. I got a lot of use out of this:

Learn iPad keyboard shortcuts - Apple Support