Specific knowledge is something you learn and knowledge you cannot be trained for. Specific knowledge is found by pursuing your genuine curiosity and passion rather than whatever is hot right now. Become the best in the world at what you do (your specific knowledge) and keep redefining what you do until this is true.

Exploring what is mine, and hopefully it makes you think what is yours.

Everyone has a boss. Someone said this, and is true.

You are likely to manage people and be managed by someone. If you are a freelancer, it could be your clients. If you are an entrepreneur, it could be your board. Since we will all share this fate, we must try to understand the kind of managers that you might encounter and more importantly, understand the type of manager you want to be.