Maybe I'm simplifying and applying a template to the "happy ending" cliche.
Once you read this, you'll start seeing that every popular movie today follows this guide, almost precisely to-the-minute. Book says "by page X of screenplay, Y should happen" and you'll see that it does.
The original pattern had the Shaman travel into the world of the supernatural to complete a kind of quest to solve a problem back home. In the Western world, the "supernatural realm" stopped catching on after a while, so we got first the Hero's Journey (vice Campbell) and the modern version of that myth, the MIH/BMG story where the protagonist gets into trouble and out again, possibly while staying in the same town all along.
"A hero ventures forth from the world of common day into a region of supernatural wonder: fabulous forces are there encountered and a decisive victory is won: the hero comes back from this mysterious adventure with the power to bestow boons on his fellow man."