But according to what Han Xin said when he attacked Zhao Guo, "Trapped in a place of death and then survive, put it in a place of death and then survive." When fighting with Han Xin, he used the tactic of "attacking halfway across the border". It can be confirmed that Han Xin has studied "The Art of War" by Sun Tzu, and it can be confirmed that he is self-taught, because like Han Xin, who has a character of repaying kindness, if he is following If he learned it from his teacher, there will definitely be some records of him repaying his teacher.