While all the books in the series have been successful, the first book is considered the most popular for several reasons:
* Originality: It introduced the lovable and relatable character of Greg Heffley and his hilarious struggles with middle school life.
* Nostalgia: Many readers grew up with the first book and have a special place in their hearts for it.
* Wide appeal: The book's humor and themes resonate with kids and adults alike.
While later books in the series have their own unique storylines and characters, the first book remains a cultural phenomenon and the cornerstone of the Diary of a Wimpy Kid franchise.