that you give way on a roundabout to the right?
that if you intend to turn a corner/ change lane you use an indicator?
that if you are on the motorway and someone is indicating, it is polite to pull over to let them out if it is safe to do so?
that if you are driving at night, regardless of whether the area is well lit (eg. a supermarket carpark) you put your lights on?
that if a car is parked but there is still room for two cars to pass, you DON'T sit there like a lemon waiting for the approaching cars and expect to be thanked for it?
etc, etc, etc