The jump smash is the shot in badminton. Use the side ways stunt with the rear foot back and parallel to the backline. The stunts should be wide.
Using a relax forehand grip, help bring the racket back with the string facing downwards. Elevate the non racket arm for balance. Create a potion with the shoulder and elbow in align looking at the front arm.
Load the rear leg muscle to generate power. Drive through hit first then the body hitting the shuttle in front of you. Land with the wide stunts non racket then racket foot in quick succession and then recover.