What is Zhuge Liang's excellence? Why did Zhuge Liang only help Liu Bei?

Judging from the Romance of the Three Kingdoms, Zhuge Liang’s greatest strength is his evildoer’s wisdom and rich knowledge. Not only did he command many classic battles, such as the burning of Bowang Slope and the seven captures of Meng Huo, etc. He also created many things, such as Bagua array, wooden cow and flowing horse, etc. The straw boat borrowing arrows and skillfully borrowing the east wind show his rich knowledge of astronomy and geography. In the Romance of the Three Kingdoms, Zhuge Liang is as wise as a demon.

The most direct reason why Zhuge Liang helped Liu Bei was the many visits from Liu Bei's three brothers. Zhuge Liang is very proud, of course he also has the ability to be proud. A proud person like him would not rush to seek official positions with others. It happened that Liu Bei personally visited and visited the thatched cottage three times, so he dedicated himself to Liu Bei and died.

Also, a person as powerful as Zhuge Liang is very confident. In Zhuge Liang's view, there is no challenge in helping Cao Cao or Sun Quan unify the world. In other words, if Zhuge Liang joins Wei or Soochow, he may just be a think tank. Only helping people like Liu Bei who have nothing to unify the world is the most challenging, and only helping Liu Bei can be the most important.

This was later confirmed. Zhuge Liang went down in history for helping Liu Bei establish the Kingdom of Shu, and Liu Bei also entrusted him with an orphan in Baidi City.