The first is opportunity. No matter how strong a person's ability is, it is impossible to achieve anything without proper opportunities. It was in a very good historical background that Liu Bang had the opportunity to become the founding king step by step. At that time, the poor in China couldn't stand the tyranny of the Qin Dynasty, and peasant rebels led by Chen Sheng and Guangwu held armed uprisings all over the country. In this context, Liu Bang himself accidentally violated the laws of the Qin Dynasty. In desperation, he summoned 3000 children from his hometown to rise up. He attacked Peixian County first, then defected to Xiang Liang, and was enfeoffed as Hou Wu 'an by Xiang Yu. After accepting the surrender of Zi Ying, King of Qin, he was named Hanwang by Xiang Yu. After several years of Chu-Han War, Xiang Yu was finally defeated and the Han Dynasty was established.
Secondly, the leadership ability of knowing people and being good at their duties. The wind is in cloud flying, and the warriors are guarding everywhere. This is Liu Bang's attitude and feelings towards talents. Liu Bang himself is not good at fighting, nor can he compare with Fan Kuai and others. Governing the country depends more on Xiao He, but Liu Bang can control outstanding talents, which is in sharp contrast with the headstrong Xiang Yu. Especially on the issue of using Han Xin, Xiang Yu's camp didn't take Han Xin seriously at all, and Liu Bang, on the recommendation of Xiao He, attached great importance to Han Xin's military talents and entrusted him with an important task, and finally defeated Xiang Yu by relying on Han Xin's talents.
Moreover, the mentality is detached. Liu Bang's aloof attitude, even his willingness to show his feelings, is a shortcoming for ordinary people, but an advantage for a strategist and politician. During the battle between Chu and Han, there was a battle in which Xiang Yu bound Liu Bang's father and daughter to force Liu Bang to surrender. Liu bang was unmoved and shouted at Xiang Yu: Brother, if you dare to cook my father, remember to give me some soup to drink. It can be seen that Liu Bang has a calm and detached attitude at the critical moment, and can even propose his precious relatives.
To sum up, although Liu Bang achieved nothing at the age of 40, he possessed the basic qualities of dominating the world. More importantly, he seized the opportunity to make a difference.