Reason 2: Learn and gain expertise

One of the best ways to learn and gain expertise in the topic you are interested in is to write a book on the subject! Realistically, writing a book will require you to focus on a specific topic for many months. If you choose a topic you are passionate about, you will get to learn about it. What’s more, it’s fun to spend time on something that you love, and that’s a huge reward in itself!