I have already come up with 50 ways that a management company can screw you for profit without you ever knowing(or not finding out for awhile). Did you have an inspection before you made an offer on the property? Do you have a picture of the property you bought? How do you know if that picture shows the house you actually own? or if it even hows the ‘current’ state of the house you own?
A normal distribution (bell curve) is the limit of what one would find by adding up the value of many independent quantities such as the height of people in a large group. A power law distribution is the limit of what one would find by multiplying the value of many independent quantities such as the relative size of forest fires over a large enough area and a long enough period of time.

If you’re a YouTube personality, this is how you generate your income. An amazing example of this how Antonio Centeno got 1 million YouTube subscribers. If you’re a blogger who gets a lot of traffic to your site and uses advertising or sponsorships, then you’re also following the AA Model. Got a podcast with sponsorships? Same deal. I talk about successful podcast sponsorships and other ways to make money podcasting here:
New World Wealth publishes reports tracking the total wealth of countries, which is measured as the private wealth held by all residents of a country. According to New World Wealth, India's total wealth increased from $3,165 billion in 2007 to $8,230 billion in 2017, a growth rate of 160%. India's total wealth rose by 25% from $6.2 trillion in 2016 to $8.23 trillion in 2017, making it the sixth wealthiest nation in the world. There are 20,730 multimillionaires (7th largest in the world) and 119 billionaires in India (3rd largest in the world). With 330,400 high net-worth individuals (HNWI), India is home to the 9th highest number of HNWIs in the world.[335] Mumbai is the wealthiest Indian city and the 12th wealthiest in the world, with a total net worth of $950 billion in 2017. Twenty-eight billionaires reside in the city.[336] As of December 2016, the next wealthiest cities in India were Delhi ($450 billion), Bangalore ($320 billion), Hyderabad ($310 billion), Kolkata ($290 billion), Chennai ($150 billion) and Gurgaon ($110 billion).[337][338]
Although renting out your room or home can also be a side hustle to make extra cash, it's also a great source of passive income. However, another route to go is to get an income property just for the purpose of renting it out. This is even better if you live in a touristy area, because you can probably make even more than usual during the high tourist seasons.
Investing in a business: Another good way to generate passive income is to invest in a business --even a small one -- in return for a percentage of the profits - just like Shark Tank, only smaller. Lending $10,000 to a local business that, for example, is working on a mobile app for Apple phones could lead to a passive income-generated share of the profits when that mobile app starts selling like hot cakes.
You are also free to choose a fund that is based on any index that you want. For example, there are index funds set up for just about every market sector there is — energy, precious metals, banking, emerging markets — you name it. All you have to do is decide that you want to participate, then contribute money and sit back and relax. Your stock portfolio will then be on automatic pilot.
Ancillary Activity Test - The nonresident’s presence in Connecticut is ancillary to his or her primary business or employment duties that are performed at a base of operations outside of Connecticut. Ancillary activities are those activities that are secondary to the individual’s primary out-of-state duties, and include such things as presence in the state for planning, training, attendance at conferences or symposia, etc.
Who cares, especially when very conservatively, the ultimate passive income includes a six digit or more base lease, plus an estimated additional six digits or more for rate increases and another six digits for more for various smaller and one bigger technology increase at 25 years. All four (base, rate, smaller and mega technology increases) combined, certainly could yield much more depending upon inflation, rate increases and technology increases?
You can also participate in focus groups. Focus groups are hired to test products and give opinions before they reach the market. You would be a critical component of verifying they will have success and reach a high return on their investment. Surveys and focus groups are not ‘get rich quick’ schemes at all, but you can generate a few hundred a month.
However, I think for those who are willing to do what it takes, the sky is the absolute limit. As an example, I’m trying to take a page out of FinancialSamauri’s book and create an online personal finance and investing blog. It is an enormous undertaking, and as a new blogger, there is a seemingly endless amount of work to be done. That said, I hope that one day I can not only generate some passive income from the hours of work I have put and will put into the project, but I hope to be able to help OTHERS reach their financial goals.
Investing in rental properties: Another form of real estate investment, rental investments (i.e. becoming a landlord) could steer you down the passive income path of steady monthly rent checks that you can use to pay off a mortgage loan on the rental property. After the mortgage is paid off, those monthly checks go right into your bank account -- potentially for years to come. 
An obvious example is over exposure to bank stocks, which have been excellent investments for over a century.  Though a foundation of most portfolios, bank stocks do involve more risk at certain stages of the economic cycle than many realise.  Being less exposed to bank shares in the last few months could have preserved some capital.  So, a more diversified approach can help mitigate some of these risks.