This one is entirely visual.
Draw a full circle with your racquet, visualizing the face of a clock.
At 3 and 9 o’clock, your arm is horizontal, the racquet head is well away from your body.
Down at 5 and 7 o’clock your arm points down, the racquet head falls below your hand, and your reach is not as extended as it was at 9 and 3.
Use this feel to know that when balls are low (5 and 7), you actually want to play them “inside” but when balls are bouncing up (9 and 3) you actually want to play them “up and away.”
The circle of play is a natural way to feel how your arm moves at various heights, and how to position for the low and high shots.