Use the Alt key.
For example, open Word and press Alt to show the keyboard commands. If you want the keyboard commands for the Home tab, press H as shown.
Alternatively, to open the Ribbon and show the keyboard commands for the Home tab, press Alt-H.
So, if you want to center some selected text in Word, press Alt, H, then AC
If you want to insert an image, press Alt, N, P and so on.
The Ribbon makes Office programs much easier to use, so you probably won't want to learn many of these key sequences. However, the ones you already know will almost certainly work.
For the record, I much prefer Windows 10. However, the fact is that Apple doesn't sell any of the hardware I use. It doesn't make a proper tower desktop and it doesn't make a small rotating-screen laptop that doubles as a touch tablet.
Even if I was willing to compromise on hardware, less-functional Apple products would cost 2x to 4x more.