I think it is supremely useful to have a deep understanding of one subject, not necessarily so that you're an expert of that subject, but instead so that you ex

I think it is supremely useful to have a deep understanding of one subject, not necessarily so that you're an expert of that subject, but instead so that you experience the process of working hard to understand something. The challenge of learning something deeply requires more focus, and the focus skills you gain can then be reapplied in the future to learn other topics more quickly.