Hooks are how the story grabs the reader’s attention and keeps it page after page. Entertaining and surprising them, forming an emotional connection between them, the story, and its characters.
Your opening scene determines whether people will read your book or not. If it doesn't capture your reader's attention in the first couple pages, they'll likely put your book down and find another. With the speed of today's world, people no longer have the time or patience to wade through a slow beginning. No matter how engaging the rest of the book is.