What is the Book of Heluo? thank you

The Heluotu, also known as the Heluotu Classic, is a famous legend of ancient civilization in China. Six or seven thousand years ago, the dragon horse jumped out of the Yellow River and had a river map; The tortoise came out of the puddle with a letter on his back. Fuxi drew eight diagrams according to the book of He Tuluo. After that, Dayu managed the flood, Hebo presented the river map and Fu Fei presented Luo Shu, so that Dayu finally defeated the flood. As for China's astronomical achievements in ancient times and the highly mathematical achievements seen by modern people from the Book of Hutuluo, that is the subject of experts' research. We know that the ancient gods in China are representatives of culture, so the images of Fuxi and Nu Wa often hold rules and regulations in their hands. Hebo and Fu Fei's "The Book of Hutuluo" also represents their lofty position in ancient times, right?