The book is about building a beautiful mind to enhance ones' appeal (regardless of IQ, knowledge, or looks).
First 7 chapters deals pretty much with holding a decent conversation. Much of this sounds like common sense, but sometimes 'not so common' to some people. When holding a conversation, agreeing to everything is no good, as the other party might as well be talking to himself. Disagreeing everything is bad as it shows a mind that wants to demonstrate superiority to others (thus is ugly). There are many levels in between total agreement and disagreement. You can agree on certain points and disagree on certain points (agree to disagree). The key is to find out what you agree and disagree based on mutual understand of each others' values, point of view, personal experience, and extrapolation of what happens in the future. Once you understand the other party's 'logic bubble', you would be able to hold a better conversation without misunderstandings and negative emotions. To make the conversation interesting, you should also supplement , speculate, provide what-ifs, be open to alternatives, and explore points of interest. Edward explores the way you can do all these.
Chapter 8 addressed the concept of "6 Thinking Hats" or Parallel thinking (Edward has a whole book on this btw). In a Court of Law, a prosecutor will not mention points which will help a defence case, and vice versa for the defence attorney. Our usual thinking is based on using arguments as a method, as put forward by the Greeks: Socrates, Plato and Aristotle. In an argument, each party is usually looking from his own side. Edward gives an alternative method called Parallel thinking where everyone explores the same side, and goes around to all sides until a complete view is understood. This is covered in more details in another book.
The book is easy to understand and digest, and filled with interesting examples of cases where we should look at both sides to understand the whole picture. I also liked the way that some concepts are indexed (see also page so-and-so) which makes it easy to refer. The book has been an interesting read for me.