Particularly regarding the differences between front-, rear-, all-wheel-, and four-wheel-drive vehicles. When driven with proper technique, every type of drive configuration will respond identically to your inputs. The major differences appear quite clearly when you use improper technique.
"Just wanted to let you know - driving home from my Second Gear course, I put my new knowledge into action. The roads were really slick and I came over a hill and found multiple cars off both sides of the road. An oncoming car came into my lane, forcing me onto the even slicker shoulder. My car started sliding right toward the police cruiser and all the pedestrians standing off on the side. Somehow, my brain remembered to take my foot off the brake, my car regained traction, and I was able to steer right past the whole mess. Thank you! I would not have been able to do that last week."
~ Helen I., Second Gear graduate