Final answer:
The author develops the central idea about what you should know about your brain by discussing the mind-body problem, the role of psychology and cognitive science, and the importance of reflective thinking to overcome cognitive biases.
Step-by-step explanation:
The author develops the central idea about what you should know about your brain by discussing the relationship between mind and brain, the mind-body problem, and the ways in which psychology and cognitive science can help us understand how to become better thinkers. The author emphasizes the need for reflective thinking to identify and overcome cognitive biases and develop good habits of mind. By understanding how the brain works and being aware of our biases, we can improve our thinking and succeed in philosophy.