What are the two ways people drive away the New Year in legend?

Legend has it that people drive away the New Year in two ways: pasting scarlet letters and setting off firecrackers.

There is a legend about the origin of the Spring Festival. In ancient China, there was a monster called Nian, who lived under the sea for many years and climbed ashore every New Year's Eve. People fled to the deep mountains to avoid the harm of Nian beast. Then one year on New Year's Eve, an old man outside the village told people how to drive away Nian beast.

It turns out that Nian was most afraid of red, fire and explosion. Since then, every year on New Year's Eve, every family has posted red couplets and set off firecrackers. Every household has a bright candlelight, so it is better to wait for the New Year. In the early morning of the first day, I want to say hello to my relatives and friends. This custom spread more and more widely and became the Spring Festival.

Other legends of the Spring Festival:

According to legend, a long time ago, a young man named Wannian saw that the festival was chaotic at that time and had a plan to make it accurate. Inspired by the shadow movement and the dripping spring water on the cliff, he designed a sundial and a clepsydra to measure time, so he had a perpetual calendar. It is said that the Spring Festival comes from the perpetual calendar, which was created in the evergreen year. ?

Legend has it that one day more than 2000 BC, Shun (the leader of the ancient tribal alliance) followed the leader of the tribal alliance and led his men to worship heaven and earth. Since then, people have regarded this day as the first day of the first month. It is said that this is the origin of the Lunar New Year, which was later called the Spring Festival.