•Why it earns a slot
Every modern idea about what makes a story work, three-act structure, the flawed protagonist, plot over spectacle, traces back to this one set of lecture notes on Greek tragedy.
Aristotle's Poetics is the first systematic attempt to explain why tragedy works. Writing what were probably his own lecture notes rather than a polished treatise, he breaks drama down into six components, argues plot matters more than character, and defines the specific kind of flawed hero that makes an audience feel pity and fear rather than mere shock or satisfaction.
This distillation is written from the freely available original, which is always the better read when you have the time: Project Gutenberg.