What development stages did neo-realism go through from birth to recession?

After World War II, a literary trend of thought first appeared in Italy in the mid-1940s. It is the product of the resistance movement, which lasted more than ten years from birth to recession and experienced different stages of development. It first appeared in the field of film, and later extended to the fields of plastic arts and literature. It has no unified theoretical program, and most young writers belong to this trend. Their artistic styles and aesthetic views are different, but in the choice of themes, they all focus on reflecting the resistance movement and the southern issues, and have successfully created new heroes in the history of modern Italian literature-anti-fascist fighters, guerrillas, thugs who seized land, etc. And praise their noble quality.