Three Kingdoms: Travel in Three Days, the Whole Network Offers Advice

A prompt sounded suddenly in Cao Zihuan's mind: "Host, please be prepared. After the countdown ends, you will travel to the Three Kingdoms!" Accepting the fact that he would travel through time in three days, he came to Zhihu to post for help, and big guys from all over the world offered their advice. Travelers must have various technologies such as sacred books, gunpowder, steel, and ships. The textbooks from elementary school to university are all memorized in Cao Zihuan's mind due to his photographic memory! After time traveling, Cao Zihuan vigorously developed industry and commerce in the Three Kingdoms, defeated Liu Bei and Sun Quan, and unified the world! After ascending the throne and proclaiming himself emperor, he conquered the world with his ocean fleet, aircraft and cannons! Cao Cao: "My son Huan will be the emperor of the ages!" Liu Bei and Sun Quan: "How can we fight?!" Zhen Ji: "My husband is the invincible fighter on earth!"