This is all I need to learn how to do self-defense. When I'm thinking about how to learn self-defense I always looking back in the times that I almost got killed because of the 2 guys hold up me back in 2010. At that time I really don't know what to do, I'm scared and the only thing I did is to give them my bag even though there is nothing in that bag but my work clothes only. The one guy driving the single motor and the other guy put the knife on my abdomen. That was really the scariest moments in my life and I always thanked god for protecting me. So, it's really important to learn self defense.