The part about knowing who you are trying to sell to seems elementary and over explained. Hopefully for all sales folks, that's kind of the first thing right? How can you find a win win if you don't know what they consider a win?
I wish this book spoke more about how to pinpoint their true fears, objections, and/or interests because that takes a lot of experience in asking questions in specific ways and then repeating them back to them to check if the person really believes what they just said or is just being slimy, etc...
I think a lot more can be said about your "ideal customer" too. That's a big deal to me