With most stories, you already know how they’re going to turn out before they begin. In general, the good guys are going to win. If Bob needs to get the magic saddle, you know that by the end of the story he probably will. Unless you’re reading Stephen King, of course. But that’s not really what stories are about. Stories aren’t about what happens, they’re really about how it happens. How is the good guy going to win? What steps and challenges will he have to face and overcome along the way?
The what is pretty simple, and can usually be described in just a sentence or two. Bob needs to get the magic saddle. He does. But how does he get the magic saddle? Ah, now there’s the story.