You cannot control the speed of motors of your drone unless you use speed controllers. They enable you to control the voltage and current of the motors and hence control the speed, which is the first priority to move the drone one place to another, after floating in the air. You need to increase and decrease the speed of motor(s) to move the drone forward, backward, left, or right.
The connection between the controller board of the drone and ESC and the battery/power distribution board will be shown in Chapter 2, Assembling Your Drone:
Refer to the following circuit diagram:
