LESSONS LEARNED IN TO KILL A MOCKINGBIRD
Boo Radley. From Boo (as well as Dolphus Raymond), the children learn that people are not always what they seem. Jem and Scout eventually learn that the rumors about Boo have no basis in fact, and they recognize that Boo is not to be feared but is only trying to be their friend. In the end, Boo turns out to be their life-saving hero, and not a bloodthirsty ghoul.
The Jury. Both Jem and Scout see what Atticus already knows: That no jury could "possibly be expected to take Tom Robinson's word against the Ewells'." Jem believes that juries should be abolished, and Scout sees that "in the secret courts of men's hearts, Atticus had no case. Tom was a dead man the minute Mayella Ewell opened her mouth and screamed."
Teachers. Scout discovers first-hand that a progressive college education doesn't necessarily translate into good teaching skills. Miss Caroline is clueless about the people of Maycomb as well as the the important aspects of learning, and Miss Gates's sympathy for the German Jews doesn't extend to the Negroes in her own hometown. Consequently, "I could not help receiving the impression that I was being cheated out of something."
Religion. The good ladies of the Missionary Circle are dedicated to the poor, "squalid" Mruna tribe in Africa, but they have no compassion for the black population of Maycomb. Scout also questions if they deserve to be called "ladies," since their words seemed to show that they are "Hypocrites... born hypocrites..."