Elevons are used mostly in tailless airplanes, flying wings and delta wing aircraft.
Flaperons can be used in normal planes but separate flaps are more desirable for slow landing approaches. Sailplanes use flaperons to give the wing a variable camber. Flaperons down a few degrees for a cambered wing for maximum lift when slowly circling in a thermal and reflexed up a few degrees for low drag and high speeds when blasting through a region of sink or penetrating a headwind.

On a beginner's trainer, there's no reason to fool with these things.