what is an example of fairness in the book

Wow, I can give you many examples of the unfair, but the one example of fairness that first comes to mind is Atticus' defense of Tom Robinson. Atticus didn't care what anyone said or did; he defended Tom because it was fair, and even more than that, it was morally right.

Probably when Atticus makes the deal with Scout that if she goes to school, she can continue to read with him at home.