Before I mention book blurbs, I want to give you a bibliography of my books to look at. You can look most of these up on Amazon and see what the publishers did for book blurbs for them (I had a hand in some of the blurbs, but not all of them).
Here’s a lovely article about writing book blurbs. Although this is for fiction, it’s worth noting that the concepts are the same: you want to grab the reader’s attention and hold it, making them want to buy the book, take it home, and devour it.
When we are writing blurbs for non-fiction books, we’re not usually able to put a really compelling quote like “It shouldn’t be called ‘stalking’ if you’re really just trying to save someone,” (which is the opening line for a very good story I just heard about). But we can tell the reader why this book will answer questions about the topic that they hadn’t thought to ask and even pitch them on how this will make a positive difference in their effectiveness, their income stream, or their life.