How can some myths and legends in ancient China help us understand ancient times?

The legend of the five emperors' abdication shows that tribes, as the main existing form at that time, were not unified, but only recognized and helped each other on a certain level, so there was the abdication system.

The Battle of Yanhuang shows that the earliest aborigines in the Central Plains may be Miao.

Dayu's flood control shows that this may be the last large-scale melting in the post-glacial period.

The legend of Cangjie's word-making shows a contradictory mentality at that time about the convenience brought by word creation and the turmoil brought by the opening of people's wisdom.