Badminton footwork is useless unless you know what you are doing 

thank you master, i will try👍

I would advise you to use ur left hand properly especially while defending smash ur left hand is pretty close to ur body which is not good for overall balance Also ur push off step.should be very high and must sync with opponent's hitting time otherwise in shot like deception u not gonna take shuttle or rather it'd be too late for u to pick up the. So remember when opponent hits the shuttle then ur push off/split step/prep hop step should come in to move in any direction. Hope it helps to improve ur badminton a better