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Everyone starts from something new. Let's list the basics in R/C terms. If there is any topic/subject you think we should add, please leave a message below.
Well, we will start from very basics...
Battery University's web site (one of the best educational battery sites out there)
3.7 volt battery = 1 cell x 3.7 volts (1S)
7.4 volt battery = 2 cells x 3.7 volts (2S)
11.1 volt battery = 3 cells x 3.7 volts (3S)
14.8 volt battery = 4 cells x 3.7 volts (4S)
18.5 volt battery = 5 cells x 3.7 volts (5S)
22.2 volt battery = 6 cells x 3.7 volts (6S)
29.6 volt battery = 8 cells x 3.7 volts (8S)
37.0 volt battery = 10 cells x 3.7 volts (10S)
44.4 volt battery = 12 cells x 3.7 volts (12S)
ESC's use a PWM (pulse width modulation) scheme for both acceleration an braking. In acceleration, the power to the motor is switched on and off at a very high rate. The ratio of power on time to power off time controls motor speed. The more of the time the power is on, the faster the motor goes.
Similarly, in braking the electrical short across the motor is switched on and off at a very high rate. The ratio of short applied time to short disconnected time controls braking power. The more of the time the short is applied the more powerful the braking.
The drag brake setting is simply the amount of braking power applied at off-throttle.
If you could instantly move your trigger finger from acceleration to a consistent braking position (value) when you wanted to perform a stop maneuver, you would be accomplishing the as the drag brake setting.