i disagree with CF. I dont get it at all. so he has sprinters work on sprinting form/technique a ton. Then when it comes to changing direction, which is far more complex he says dont even think about form. Look, you need to practice consciously changing direction correctly enough so that you can do it sub consciously.
work on sprinting as fast as possible and then breaking down and stopping as fast as possible.
Drop your hips when you break down
then when you can stop on a dime work on stopping and taking an open step that actually moves you in the dierction you want to turn.
Then work on sprinting, breaking down, turning, and accelerating on the direction you want to go.
cut with crisp straight lines
Oh and always look where you want to go it will help you turn quicker.
there is more but that should help.