I just finished this and recommend reading “Never Split The Difference” by Chris Voss. I’ll study this book again.
Here’s a quote I liked, “One can only be an exceptional negotiator, and a great person, by both listening and speaking clearly and empathetically…being honest about what one wants and what one can—and cannot—do. Every negotiation, every conversation, every moment of life, is a series of conflicts that, managed well, can rise to creative beauty. Embrace them.“