A Good book, really short and direct, it gives you a lot of practical idea to be successful, whether you work for a company or in your own business.
It should be read more than once to get trough the ideas. It’s a consulting lecture, it may help you to come up with better solutions for specific process.
It tells you what you can do, but it doesn’t tell how to do it, but it shows many examples.
Understanding the origin of the concepts we won’t need to memorize but to think.