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After you return their shot, return to the middle of the court, so if they hit it to your left or right, you have more time to react and run to their shot, and return it back. Stay on your toes, and slightly move left and right ,so your energy and momentum is still active and you can be ready to run for the next move. This stance means that your feet should be even with your shoulders and parallel and your toes should be pointed toward the net. Keep your knees bent slightly and your racket in your hand with your arm across the front of your body. Don't stand as if you were just normally standing up, or your body will be far too stiff to move well. Be prepared to run up to the net, run cross court, back up all the way to the back service line, or to reach the shuttle from any position. The element of surprise is important here, too, so watch out for your opponent's tricks. The overhead smash is the most powerful shot in the game because it allows you to hit the shuttle as hard and fast as you can, making it as difficult as possible for your opponent to return your shot. Look for opportunities to hit this shot when the shuttle is being returned high in the air. Don't hit the shuttle right back to your opponent every time, or you'll just be making it easier for him or her to hit the shuttle right back. Your goal should be to move your opponent or opponents up and down the court or back and forth across the court so they get winded and tired and don't have the opportunity to properly return the shuttle. Don't just aim to hit the shuttle back and hope that your opponent messes up; have an idea of where you're going to hit it, how you're going to hit it, and why you're going to hit it a certain way. If you just blindly swing at the shuttle, you won't get very far. If you want to win, then you have to make your opponent play your game and make him as uncomfortable as possible. If your opponent has a weak backhand (as most beginners tend to have), hit the shuttle repeatedly toward his backhand. If he's slow on his feet, move him around. If he loves to play near the net, hit your shots long and hard. If your opponent loves the smash shot, don't hit the shuttle in the air. Be attuned to your opponent's strengths and weaknesses so you can win as easily as possible. It's important to observe your opponent closely. Whether you're starting a game or just rallying for fun, be on the lookout for your opponent's strengths and weaknesses as early as possible. Though always aiming for the overhead is nice, or hitting mostly forehands cross-court because that's your best shot is a good idea, if you do the same thing every time, your opponents will begin to catch on pretty fast. It's important to keep the element of surprise going, so your opponents are likely to be caught off guard and won't quite ever know what to expect when they play against you. This includes where you serve, which shots you prefer, and where you tend to hit the shuttle.
Make sure to always return to "the stance of readiness" after each shot. Get ready to move anywhere any time. Go for the overhead as often as you can. Keep your opponents running around. Have a method to your madness. Exploit your opponent's weaknesses. Mix it up.