How does Scout know the real world has patterns? And how did Scout conclude that their is only real fear in books?

Scout shows that even though she has discovered that people (Mr. Ewell) can be evil in unfathomable ways, she still upholds her faith in humankind and can face anything with courage. Unlike Dill, she finds that the real world does follow patterns, and once one knows them, the world of fantasy and books is the only place where real fear can exist. Despite her growth and maturation, Scout is still a child at only eight years old, and we last see her as she falls asleep in her father's arms. The author very carefully avoids giving the reader any information about Scout's future. Instead, we are left with an image of Scout when she is discovering fundamental truths about the world. She understands that the world carries both good and evil, and she has an unshakeable faith in the inherent goodness of "folks."