I am too cheap/poor to afford lessons or ball machine rental, and live in an area where tennis is more or less unheard of, so practice partners are out of the question. Which is the best method to practice your non-serve strokes? The wall has the advantage of giving you a ball moving towards you, which is a better simulation of real tennis. The disadvantage, of course, is you have not much of an idea whether your shots are in or out, let alone their depth within the court. With drop feeding, the obvious advantage is you can practice your placement since you can see where your ball lands, and you'll immediately know when you've overhit the ball. Naturally, the drawback is the fact that real tennis does not involve balls that just sit there and bounce straight up, and it may ill prepare you for a ball coming toward you. Which form of practice is better for improving your game, or at the very least, not damaging it irrevocably?