There are several components to developing speed/quickness. It would take quite some time to explain it all. And it is not something you can learn with one question or answer. And most of us that could answer your question properly, spent a lot of time, money, and effort in acquiring that ability. I would recommend that you put in the time and research to gain greater knowledge as well.
Good answers. Sprints, high intensity intervals. To get quick one has to train that way. One trains the way they play. Work at max for a short period, rest, then do it again. That’s the best way that I know to develop speed and power. Power = work x distance/time. Make it fast. And work at max.