A good one that's sometimes glossed over a bit (particularly in fixed wing, but applicable to rotary too) is transitions between phases of flight, ie cruise to initial approach to final approach to missed approach.
I find it useful to introduce these as pure flying exercises first (calling the transitions between them as required) to get the person on the controls well used to the attitudes, power changes and so on required, (and the time/distance it takes to accomplish them), before being thrown into the hurly-burly of the approaches themselves.