People who want to become authors usually have a specialty that they want to pursue. However, it is a wise business owner who finds the hot niches first and then goes out to write about them. This way, you know there already is a market for the e-book before you even put a single word to paper. While you do want to go into something that sets you on fire, there is probably one angle above others that will help it to sell more. Remember that people will buy e-books because they have a problem that they want solved or they need more information on a specific issue that will enhance their lives. If your passion is jewelry, you may find that an e-book on how to pick out an engagement ring might be a hot topic. You want your niche to be specific enough to attract the demographic you already have as an audience, but not so wide that it seems too broad-based to offer any useful information.