I am writing a sci-fi/fantasy story and i need some information on what kind of hand-to-hand combat techniques different types of people would use. For example, how would a woman that has was taught how to fight from a teacher fight differently from a woman that learned how to fight by experience? What tactics would a man use to fight multiple opponents in open space? Also, what parts of the body damage one's fists more when you punch there? How is a kidney blow different from a liver blow in their effects? Stuff like that, any help is much appreciated.