What is the story Who Killed the Mockingbird?

there are different themes without the novel, these are

-bravery/ courage shown by jem which is one of the main themes

-childish innocence seen in scout

Obviously, RACISM was the main part this book was made for (dont know how you missed that)and Mrs. Dubose exemplified just as much bravery as Jem -you'd know if you read the book
the theme of the mockingbird in To Kill a Mockingbird is that, well, the mockingbird (like it said in the book) doesnt do anything or harm anyone- it just sits and chirps. and so, to kill a mockingbird, means that you are killing something that is very innocent... which can relate to people who judge people who are innocent.... if that makes sense!