This book transformed the way I thought about work and my career. It is one of the things that propelled me into wanting to rise above being merely good enough as a developer and attempt to be world class. This book will help change your mindset into becoming a top performer in a lucrative field of your choice.
It heavily criticized the "follow your passions" narrative and instead teaches that becoming great at something will make you passionate about that thing.
The biggest takeaways I had from this book is that you have to work hard in order to set yourself apart in your industry, and if you want to follow your passion, make sure you understand what that means to your pocketbook.
A good follow-up to this book is Deep Work, also by Cal Newport.