Atticus is courageous for representing Tom Robinson. The town that Atticus lives in is a town filled with racism. The town's usual diseases is racism. Atticus knows this better than anyone but still chooses to accept Tom's case and fight because of his morals. His biggest reason for fighting is that he says he wouldn’t be able to live with himself and tell Scout and Jem what to do. As you can see, Atticus's decision in fight was a very courageous move.
Scout is courageous for speaking out for her dad in front of the group of men at the jail one of the men being Mr. Cunningham. Imagine