Alright guys, if you watch the Naruto series and read the mangas, then you probably already know about the chakra networks and the purpose of their jutsu hand signals. But, if you don't, that's what this is for. In the Naruto shows and mangas, the people in the series are usually born with an abundant supply of chakra, and they use it for their different Jutsus. The chakra flows through a complex system of chakra points and networks that are similar to the cardiovascular system. The hand signals that the ninjas use make it easier to control the chakra. In order to become a ninja, a person would have to graduate from the ninja school so they can properly learn how to use their chakra and behave like a ninja.