Nu was an important part of ancient Egyptian mythology. Nu was the god of water and represented the primordial chaos that existed before creation. Imagine a big ocean, and in that ocean, there was nothing but darkness and chaos. That's what Nu was all about.
Egyptians believed that from this chaos, life emerged, and Nu was a key element in the cycle of creation and destruction. Nu was known as the father of the gods and was often depicted as a man with a goose head who was floating on an endless sea of water. This symbolizes the fact that the water was the source of life, and Nu was the life-giver.
Nu was also closely associated with the sun god Ra. According to the ancient Egyptian belief, Ra traveled across the sky during the day and entered the underworld at night. Nu was believed to be the tunnel that Ra traveled through on his journey through the underworld.
In Egyptian mythology, the god Shu was the air that separated the earth from the sky, and he was drawn from the waters of Nu. Geb was the earth and was born from the union of Shu and his sister, Tefnut. In this way, all of creation was born from the waters of Nu.
In summary, Nu was the god of water who represented the primordial chaos that existed before creation. Egyptians believed that all of creation was born from the waters of Nu, and he was closely associated with the sun god Ra and the emergence of life.