What is the plot of "Call Me Maria"? It's for homework, but I do not know what a plot is.

A plot is "the main events of a play, novel, movie, or similar work, devised and presented by the writer as an interrelated sequence." (Oxford Dictionary)

Call Me Maria tells the story of Maria, who is a fifteen-year-old immigrant from Puerto Rico. Over the course of the novel, we learn about Maria's reasons for moving to new York, and her struggles with identity, loneliness, the separation from her mother who has remained behind.