Deep down, or maybe not so deep down, writers know the value of a good opening sentence. Because writers are readers and have read a multitude of first sentences that draw them straight into the story. Even if you don't know how, you know why: the hook. That magical gimmick that entices readers to keep reading, to buy the book, to read to the end, to tell their friends.
So I'm sure you know why you need The Hook. But how to create it? Structure it? Incorporate it into your story?