This book is purely about the basics of penetration testing and ethical hacking. If you already know how to perform a basic penetration test you will probably learn nothing new. I have never read something about penetration testing nor hacking before, but I would say that now, after reading this book, I would be able to perform a simple penetration test. I do not say that I am an expert now, but I know the required steps and I am able to use the basic tools. The rest comes with further reading/learning and of course PRACTICE.