There were many popular online novels that could be used as reference: 1. Fantasy novels: Usually describing fantasy, magic, and other elements. The protagonist improves his strength through cultivation, combat, and other methods to finally defeat powerful enemies to achieve his goal. 2. urban novels: mainly about the protagonist's life and work in the modern city, through interpersonal relationships, emotional entanglements and other plots to show the good and evil of human nature and growth. 3. Science fiction: It mainly tells the story of the future, technology, and other elements. The protagonist changes history or predict the future through exploration and invention. 4. Wuxia novels: They usually describe the protagonists of the ancient Wuxia world who became martial arts masters through cultivation and combat to uphold justice and defeat evil forces. 5. Romance novels: mainly about love stories. The protagonist usually shows emotional entanglements through love, marriage, etc., and finally conquers all difficulties. These are just some of the common types. There are many other types of online novels such as historical novels, horror novels, fantasy novels, and so on.