How does the Audi MMI system work?

I'm interested in purchasing an Audi with the MMI system, but I'm not sure how it works. Can someone explain it to me?

The Audi MMI system is a user-friendly interface that integrates your car's infotainment, communication, and navigation systems. It is controlled by a knob and buttons located on or near the center console.

I've found the best way to learn how to use the MMI system is to experiment with it while parked in your driveway. That way you can get comfortable with the controls before using it on the road.