Scout teaches us a bit about Maycomb's social ladder. She tries to explain to Miss Caroline about how the Cunninghams won't take anything they can't pay back. She also tries to explain the tradition of the Ewells only coming to school on the first day. Scout gives us a glimpse into two of the families that become very important in the rest of the book.
We also learn that the school Scout attends is a bit hypocritical. Scout is punished for knowing how to read and write early rather than rewarded. This is the first we see of the hypocrisy theme that will be evident in the book.