Comfort and Convenience
Cabin temperature divides people more than almost anything else. One passenger's comfortable warmth is another's stuffiness, which is why agreeing a setting, or directing vents away from someone, tends to be an ongoing negotiation.
Safety and Driver Assistance
Reading the handbook section on warning lamps and gear selection before a first journey turns guesswork into recognition. Preparation of this kind costs little and removes questions that are awkward to answer in traffic.
Multimedia and Connectivity
Hands-free calling matters to anyone who takes work calls on the road; if such a function is available, learning how to answer and end a call in advance is worthwhile. Music selection is a different routine entirely.