Develop "liquid knowledge" that flows easily from one topic to the next.

Each individual mental model is just one view of reality. The challenges and situations we face in life cannot be entirely explained by one field or industry.

A mental model is an explanation of how something works. They are beliefs, worldviews or frameworks of thinking. You carry a certain kind of thinking in you to arrive at a solution to a problem.

You don't need to master every detail of every subject to become a world-class thinker.