Folk customs referred to the culture, habits, customs, and traditions of a region or country. You can refer to the following folk customs related to the novel: 1. The martial arts culture in the martial arts world, the loyalty of the Jianghu, the inheritance of the sect, the tenderness of the chivalrous bones, and so on; 2. The reasoning skills in detective novels, private detectives, dark room crimes, DNA identification, etc.; 3. Alien civilizations, technological products, space exploration, future society, etc. in science fiction; 4. Ghosts, supernatural phenomena, witchcraft, murders, etc. in horror novels; 5. Traditional festivals, customs, clothing, architecture, food, etc. in historical novels. These are just some examples, depending on the genre and theme of the novel.