Regarding the depth of comprehension of the Great Dao, Guding only learned about it after meeting Ancient Hidden.
The Great Dao is divided into five ranks based on different depths of comprehension.
Usually, below the Thousand Layered Dao Realm, due to the insufficient amount of Tao Power, one cannot perceive deeper levels of the Great Dao. Therefore, below the Thousand Layered Dao Realm, the majority of people's comprehension of the Great Dao is at the First Rank.
After the Thousand Layered Dao Realm, as the Tao Power deepens, one can start delving deeper into the Tao Power. Comprehending a Great Dao to a certain depth and allowing the Tao Power to undergo a transformation signifies entering the Second Rank.
The vast majority of Thousand Layers Dao Realm Emperors who master 1000 to 1999 Great Daos have several Great Daos reaching the Second Rank.
