Each book tackles different challenges:
* Diary of a Wimpy Kid: Greg tries to fit in, navigate middle school, and deal with his annoying older brother, Rodrick. He learns that being himself is more important than trying to be popular.
* Rodrick Rules: Greg deals with Rodrick's antics, tries to impress his crush, and navigates social situations. He learns that friendship and loyalty are important.
* The Last Straw: Greg struggles with his family's overprotective nature and tries to avoid a disastrous school project. He learns to stand up for himself and that things might not always go according to plan.
And so on. Each book presents Greg with new challenges, and while he may not always achieve a perfect solution, he learns and grows through his experiences.
Therefore, rather than a single problem solved, the series follows Greg's overall journey of self-discovery and navigating the complexities of adolescence.