Let’s continue the vintage BMW idea. Old cars obviously require quite a lot of maintenance. Many people will buy a “fixer upper” with the intention of spending their spare time repairing and restoring it. There’s a very obvious market here: a guide to restoring different BMW models. Depending on your knowledge, you could produce detailed guides for the three or four most popular models and sell them. Not everyone restoring a car will buy them, but some probably will.

And if you think, I am not a photographer, creator or designer and don’t have money to invest in real estates, ETFs and so on - don’t worry. We will also cover dozens of strategies that require no up-front investments and that could potentially earn you thousands of dollars every month - like renting out a room in your apartment via Airbnb, putting ads on your car, renting it our, hosting webinars, building a membership site, teaching online and much more! 
If you have specialized knowledge in a certain topic, you can put together an online course to teach others. For example, if you have experience in real estate investing, you can create an online course “Real Estate Investing 101”. The benefit of an online course is that once you create the course material, you can sell it to as many people as you want.