The three commonly used concepts in novel writing were expression, expression, and writing techniques. The specific differences were as follows: 1. Method of expression: refers to the narration, description, discussion, lyricism, and other techniques used in the novel. Different ways of expression will affect the emotions, atmosphere, and other effects of the novel. 2. Techniques of expression: refers to the techniques and methods used in the process of narrating the story, such as description, rhetoric, comparison, etc., which can allow readers to better understand and feel the plot and characters of the novel. Writing techniques: refers to the specific writing techniques used in the creation process of the novel, such as symbolic techniques, metaphor techniques, personification techniques, contrast techniques, etc., which can create a unique literary style and language effect. Choosing the right way of expression and writing techniques in the creation of novels could create more appealing and expressive literary works.