What is the origin of the Spring Festival in Chinese traditional culture?

There are many different stories about the origin of the Spring Festival, several of which are more representative, such as the Spring Festival originated from the Lunar New Year Festival, the Spring Festival originated from the witchcraft rituals said that the Spring Festival originated from the Ghost Festival, etc., but one of the commonly accepted stories is that the Spring Festival was sprung up by the period of Yu and Shun.

One day, more than 2,000 years ago, Shun, the son of heaven, led his men to worship heaven and earth. Since then, people have taken this day as the first day of the year. This is said to be the origin of the Lunar New Year, later called the Spring Festival.

There is another way of putting it:

The Nian is a beast of Han folklore, with a long, sharp head and abnormal ferocity. The beast lives under the sea for many years, and every New Year's Eve, it climbs ashore to devour livestock and hurt people. Therefore, every New Year's Eve, villages and hamlets of people, old and young, fled to the mountains to avoid the "year" of harm. It was New Year's Eve again, and the villagers were busy packing up their things and preparing to flee to the mountains as they did in the past years. At this time the east end of the village came a white-haired old man, white-haired old man to a family of old women said that as long as he let him live in her house for a night, he will be able to "the year" beasts driven away, only to see that day, the white-haired old man dressed in red, in the door of the house on the red couplets, in the house outside the firecrackers, banging gongs and drums, the beasts of the New Year will escape. So every year on New Year's Day, we should set off firecrackers, wear red clothes, stick red couplets, and beat gongs and drums.