What is the main idea of chapter 9

Chapter 9 lays some of the groundwork for the upcoming Tom Robinson trial, which will occupy the remainder of the novel. Atticus knows it will be a difficult time for the children, and though the reader doesn't know anything about the case yet, Atticus already claims that it is hopeless, because the jury simply won't believe a black man's word against a white man's, no matter what the evidence.There is a strong sense of individual identity against communal tradition - Atticus's preservation of his own morals and Scout's preservation of her own idea of what it means to be a girl - suggest that though Atticus's fight for justice is very difficult and lonely, the process of growing up as a tomboy in the 1930s South could be equally painful and lonely at times, and certainly contributed to Scout's strong character development. Atticus clearly encouraged Scout to be her own kind of girl, both directly and through his personal approach to his own life.