What do we learn about Scout in chapters 2 and 3 of To Kill A Mockingbird?
One of the things the reader learns about Scout in this part of the book is that she is very smart, reads at a level that her teacher thinks is disruptive, and that she is also relatively quick to judge those who don't understand the world quite as easily as her. Like most children, she struggles to empathize with someone who lacks her perspective. For example, she knows it is futile to try and give charity to a Cunningham and can't understand why her teacher doesn't get it. As a result, we also learn of her quick and powerful temper that can also get her into trouble.
After Scout tried to pound Walter Cunningham into the dirt, we also see her ability to learn when she is taught a lesson by Calpurnia and her father who make it clear that Walter and the other Cunninghams are to be respected even if they don't have nice things and a nice house like the Finches. Scout seems to learn a little empathy when she sees how Chuck Little defends Miss Caroline and when Atticus suggests that she not mention her reading at school anymore as a sop to Miss Caroline.