Rent out a room in your home to travelers. If you live in a city or a popular vacation spot, there are probably lots of people passing through looking for a place to stay for a night or a couple of weeks. Even if you don’t live somewhere with a lot of traffic, you can still use a rental website to find people who are willing to pay to stay in your home.
Now that Mr. Dennis has died, I'll add my review. He spends the first two-thirds of the book telling you why you probably do NOT really want to get rich. He's quite convincing, and he convinced me of what I already sensed: I don't care enough about the benefits of riches to pay the price to be wealthy. I already have all I need. But I read the rest of the book anyway, because he's an entertaining writer.
We all wish we could be wealthy. For most of us, it's a far-off dream that someday, eventually, we might be able to turn ourselves into self-made millionaires. But the truth is, building wealth isn't about putting all your hopes into "someday." You're never too old to start building wealth, but if you start when you're young, you have far greater potential to amass a fortune--and more time to let that fortune compound itself as you grow older.
The folly of youth is believing that there's always enough time for everything. Youngsters often believe that retirement, or wealth building, is something that comes later in life, and are more preoccupied with the concerns of the now. Unfortunately, this often leads to a cycle of "Oh, I should do that next month," month after month, until before you know it, you're 10 years older and you've missed out on a decade's worth of compounding interest. The first step is to stop procrastinating; saving and investing is scary, but the longer you wait to do it, the fewer advantages you have.