The author didn't really talk about everything..... In many states you need a food handler's permit to cook food to be consumed by other people, or even to serve it. Often you must cook it in a commercial kitchen. Most of these ideas wouldn't work, because you must have a great deal of talent or a very large amount of starting money, such as ideas like a store window painter, or a jewelry maker. Most people would rather hire professionals to actually get the work done, then to trust something to a kid. I'm 12 years old and I'm glad I did not buy this book at full price, but found it used at a thrift store.