The Diary of a Wimpy Kid series follows middle schooler Greg Heffley navigating awkward social situations, family chaos (annoying older brother Rodrick, younger brother Manny, parents), and his quest for popularity, all documented in his illustrated journal. Each book details his failed schemes, friendship struggles with best friend Rowley, and middle school absurdities like the "Cheese Touch," as Greg tries to survive with humor and relatable mishaps.