As one of the most famous leaders of the Three Kingdoms period in China, Cao Cao was the best of his contemporaries in terms of wisdom and ability, and the Cao Wei group established by him was also regarded as the strongest force in the Three Kingdoms period. However, although Cao Cao said that his ability was excellent, his carefully managed foundation eventually fell into the hands of the Sima family, and he completely changed his surname to the Jin Kingdom. What is causing all this? The reason for this is that we will find that Cao Cao actually made five irreparable mistakes in his life. 1, sleeping by mistake, Cao Cao's preference for wives must have been heard of by everyone. There are sixteen people in Cao Cao's harem, most of whom are either wives or prostitutes, maybe Cao Cao is a woman who likes to snatch from others. But if you like a wife, you like a wife, he just slept with the person who shouldn't sleep the least, and that person was Zhang Xiu's sister-in-law Zou. It is said that in the second year of Jian'an, Cao Cao went to conquer Zhang Xiu, and Zhang Xiu was ready to surrender knowing that he was invincible, but at this juncture, Cao Cao fell in love with someone's widowed sister-in-law Zou and forcibly occupied her. Zhang Xiu was very ashamed after hearing this, so he reorganized his troops and horses to attack Cao's army at night, and finally led to the death of Cao Cao's eldest son and general Dian Wei, and Cao Cao's original wife Ding also resolutely broke off with Cao Cao after knowing this. 
2, the story of the wrongful killing of Cao Cao and Hua Tuo is very widespread, when Cao Cao asked Hua Tuo to see a doctor, Hua Tuo said that he would have to open his head to ** his illness, but Cao Cao thought that people were trying to harm him, and then killed Hua Tuo. Then Cao Cao was really ill in his later years, and the headache kept repeating, and finally died of illness. If he hadn't killed Hua Tuo at that time, even if he didn't do craniotomy, someone would still have extended his life. 3, the wrong person to leave one person and the wrong person to say that after Liu Bei defected to Cao Cao, Cao Cao clearly noticed that Liu Bei also had the ambition to build a country, but he did not remove it when his wings were not yet full, nor did he drive him away immediately, but instead talked about heroes with his wine, which was quite sympathetic. As a result, Liu Bei later successfully rose and became Cao Cao's fierce rival, adding a lot of blockages to Cao Cao and seriously hindering Cao Cao's great cause. 
4. Wrong belief that one person said earlier that Cao Wei was finally replaced by the Jin Dynasty established by the Sima family, and the problem was actually Cao Cao in the first place. However, Cao Cao did not trust and reuse Sima Yi very much, on the contrary, he warned his son Cao Pi not to trust and reuse Sima Yi before his death. As a result, Cao Pi turned around and forgot this warning after Cao Cao's death, and reused Sima Yi vigorously, laying the foundation for the later seizure of power by the Sima family. However, in the final analysis, Cao Cao was not ruthless enough to directly pull out the scourge of Sima Yi during his reign. 5, misplaced a person Speaking of employing people, Cao Cao is also a person who cherishes talents, and he always has to work hard to buy talented people, and the most famous of them is that he wants to subdue Guan Yu's deeds. Cao Cao had long admired Guan Yu's combat ability, and even after defeating Liu Bei and successfully capturing Guan Yu, he did not get rid of him immediately, but tried his best to bring him under his command even though he knew that Guan Yu and Liu Bei were sworn brothers and would not easily defect. 
He has always treated Guan Yu with courtesy, and gave him ** Houlu, hoping that Guan Yu can be loyal to him one day. It's a pity that Guan Yu is a very righteous person, and as soon as he finds an opportunity, he runs back to continue to assist his lord Liu Bei. If Cao Cao is more ruthless and directly gets rid of Guan Yu, I'm afraid it will be much easier to deal with Liu Bei in the future. Of course, Cao Cao, who made a few "mistakes", is still a generation of heroes, and his great achievements are still eye-catching, but if he hadn't made these mistakes, he might have developed better, what do you think?