Herbert and Wilma are married and file a joint return. Healthy Food, an S corporation, is a grocery store business. Herbert is Healthy Food's only shareholder. Plum Tower, an S corporation, owns and rents out the building. Wilma is Plum Tower's only shareholder. Plum Tower rents part of its building to Healthy Food. Plum Tower's grocery store rental business and Healthy Food's grocery business aren’t insubstantial in relation to each other.
Squidoo (which later became HubPages) is how I got my start with making money online and over the years, I’ve probably earned $5000+. It’s great for those who don’t want to bother figuring out the self-hosted website thing. HubPages’ drag and drop platform is ridiculously easy to use. What isn’t easy, however, is getting past their spam filters. My most certainly not-spammy Hubs have gotten un-featured and it seems that there’s nothing I can really do about it. I’ve given up on HubPages, but perhaps you’ll figure out the secret recipe and have more success than I?
Finding an outstanding development team is critical for success. Don’t just go for the lowest and cheapest price. You need a balance of budget and quality. From personal experience, I’ve had the best luck with developers from Romania. That is my number one pick. When you post a job on Upwork.com, everyone will be promising you world. Do not fall for a development team that does not have good feedback and return clients. Return clients are one of the most important. This means their client was willing to return to them for more work after their job finished! That says something.
The reality of the situation is that this client doesn’t use a property management company on the rentals. I felt it was stretch to say she was a real estate professional, because she is a physician.  However, before she got her job with the clinic, she did some side work at a hospital for a few months, but never met the limits of material or active participation.  
Or you could do joint ventures/strategic alliances for your business or for other businesses and make residual cash flow for $0 investment.. that’s what I do lol. No money, no risk, little time, 20+ years working from home. Just connect companies and take a %, use the Internet to do it locally or globally, be the intermediary & connect companies…. ;-)
Another common way to earn passive income is to invest in real estate. This does involve some hefty investment on your part to get started, though, since real estate doesn’t come cheap. The goal is to earn enough back by renting out the property to not only cover your original investment, but to also turn a profit. Keep in mind that similar to letting your room through Airbnb, this venture may require some time and money to maintain. Plus, you will have to rely on others and tenants to keep the property in good shape.

Another form of passive income can come from investing in private equity opportunities in businesses that are growing.  There are certain limitations on who can invest, but can be a great way to generate passive income from profits in a business that you have very little if any active role in.  If you invest in and now own part of the business, and it is successful, you would then be entitled to regular profits from the business, and potentially even a great return on your original investment.  You can do this by either purchasing some of the business with your money, or lending your money at a certain interest rate to the business.

Investing in real estate has been around for ages.  Whether you are looking to buy your first duplex or getting into a large commercial property, rental properties can provide passive income through rents with some very appealing tax benefits.  This method can be harder to get started with given the initial capital needed in most cases, but is certainly a great way to generate passive income.
Haha, that is too funny. I wanted to make an app back in the day called “MyShares” (You can probably tell how I cam up with the name at the time). The idea was that I would loan out books and DVD’s and then would never get them back. Then I thought, how cool would it be if I could rent those items out and that would motivate people to bring them back. Obviously, books and DVD’s are cheap, so this isn’t the money maker. The idea that would probably make the most money would be things like tools, ATVs, etc.