Here Coach James Foster demonstrates a basic key lock set up from side control, as well as the keys to finishing the hold and getting the tap. Use this video as a resource to improve your current ground game but always seek supervision.
It is always recommended to find a certified Brazilian Jiu-Jitsu instructor who can guide you through all these techniques. Do not try them on your own because you might get injured.
BJJ promotes the concept that a smaller, weaker person can successfully defend against a bigger, stronger, heavier assailant by using proper technique, leverage, and most notably, taking the fight to the ground, and then applying joint-locks and chokeholds to defeat the opponent. BJJ training can be used for sport grappling tournaments and in self-defense situations. Sparring (commonly referred to as rolling) and live drilling play a major role in training, and a premium is placed on performance, especially in competition, in relation to progress and ascension through its ranking system. To read more about Jiu-Jitsu visit Wikipedia