Answer and Explanation:
As you may already know "To Kill a Mockingbird" is a book written by Harper Lee, which portrays the injustices and violence that the black population faces in American society, by presenting a black man who has been accused, tried, convicted and executed for violating a white woman. However, this man was innocent and the woman is lying.
Harper Lee was a white woman, she did not live experiences as a black person and for that reason, she only knew the racism and discrimination that blacks went through in a superficial way, since she never went through it. This can be a disadvantage in the book, as it does not present the real life of blacks in American society. In addition, it allows the book to present a "white savior" as it promotes a great protagonism in Atticus, a white man who becomes the lawyer of the accused young black man, instead of promoting the protagonism in the black man.
On the other hand, as a white woman, Harper Lee can present the hypocrisy of white society and point out the mistakes that white citizens make in judging black people based on racist and lying thoughts. This is an advantage, as Lee calls the attention of his own ethnicity, to show that prejudice kills innocent people.