I've read over a dozen books on body language, starting with the classic Man Watching by Desmond Morris, and this, in my opinion, is the best of the lot. It will change (for the better) your ability to communicate with and understand others.
This is one of my 'must-reads'. It will change the way you see yourself and how you interact in the world. It will help you achieve your goals; and avoid being sidetracked by others who want you to achieve their goals.
The reason people often don't get what they want in life is that they don't actually work out what they want. This is the book to help you master that first step.
A nice, out of the box, deep dive into lifestyle design, supported by lots of actionable information and links to useful tools to help you create the life you would prefer.