Although it is passive income, I love helping people and find that I actually put in quite a few hours per day creating new products, talking to customers, or getting my name out there. I think you have to have this passion, and you need to keep working for your own sanity, plus to keep you ahead of the competition. Even though it is called passive income, if you lie still for too long, you could start to see your business declining.
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.