What is the origin of Vishnu, the three main gods of India?

It is said that Vishnu fell asleep on the coiled body of Ananda the serpent, floating on the ocean of the universe. Whenever the cycle of the cosmic cycle begins to "rob" (equivalent to 4.32 billion years on earth), Vishnu wakes up, Brahma, born from a lotus flower growing from her navel, begins to create the world, and Shiva destroys the world at the end of the robbery. Vishnu woke up repeatedly, and the universe was constantly updated. Vishnu in Vedic mythology is not a powerful god. But in Indian mythology, he occupies a powerful position as one of the three great gods, and has spawned countless myths. In Hindu statues, Vishnu usually dresses up as a king, has blue skin, wears a garland composed of precious stones and thick sacred thread, holds a snail, a wheel treasure, a fairy lotus flower, a bow or a sword in four arms (his weapons sometimes appear in anthropomorphic images), sits on a lotus flower or rides a golden-winged bird, Gruda. There are four hands, holding snails, plates, pestles and lotus flowers. He also has a bow and a sword. He sometimes sits on the lotus, sometimes lies on a thousand snakes, and sometimes rides on a Dapeng bird. When God and Asura stirred the sea of milk, his wife, Lady Luck, appeared. Vishnu lives in Vikangta, a paradise on the top of Milu Mountain. Lucky goddess Lakshmi and earth goddess Pumi are his goddesses. The story of Vishnu coming to earth to save the world is widely circulated in India, which is a household name. Vishnu sat on a big bird named Gada, holding a snail shell, a halo, a stick and a lotus flower. A Thousand-headed Snake Salon (or ananta Dragon) covered it up.