The great paradox of learning is that diverse expertise gives you freedom to try more new things, but gaining expertise in one area always means ignoring others, reducing your freedom. Developing expertise in anything worthwhile takes time, and your time is limited. And while it’s not every day that you embark on a new career path, you will regularly make choices about where to develop skills. Whenever you engage in additional training, take a class, jump into a new project, or even choose a book to read, you build knowledge in some areas rather than others...