For those who don’t want to make stuff up, nonfiction beckons. It’s obviously a research-heavy genre, so only the studious need apply. However, most people who write nonfiction choose a subject they already know well, which cuts down on the time needed for study. It’s one of the few genres where you can make money on stand-alone books. This is because one of the most common types of non-fiction book is the problem-solving book. You identify a problem readers have and you tell them how to solve it. If you hit on a problem a lot of readers have and…