Greg Heffley and his friends are forced to attend a "back-to-basics" school with no technology, limited supplies, and strict rules. This forces Greg to confront his dependence on modern conveniences and the pressure to conform to his classmates' expectations.
He learns that:
* Being different is okay: Greg initially struggles with the "old school" environment but eventually embraces the unique aspects of it, like learning traditional skills like woodcarving.
* Technology isn't everything: He learns to appreciate the simple pleasures of life and the value of human interaction without relying on technology.
* True friendship is about being yourself: He realizes that his friends value him for who he is, even when he's not trying to be cool or trendy.
The book encourages readers to be themselves and not be afraid to stand out from the crowd, even when it's challenging. It also highlights the importance of finding joy in simple things and embracing opportunities for growth, even if they seem unconventional at first.