We all probably prefer hitting with a human being, but I know even though tennis only requires 2 people it can sometimes be hard to find a second. In a busy world, knowing how to work a wall can improve technique, fitness, and reactions for when we do get to play with another person. Knowing what to do when hitting against a wall or backboard can make that time far more challenging and enjoyable. Here are some great videos from the Top Tennis Training channel on youtube.
Working various spins, shots, combinations, and footwork
More excellent work – the lefty forehand drill would help anyone w/ a 2-handed backhand