OK, I know what you're thinking — maybe you're not a writer. However, as Tamez says above, chances are, you're an expert sy ~something~. Also, chances are that other people want to know what you know. So whether you write an eBook on dating or tips on how to fix your car, once you write, self-publish the book, and let it go, it can sit on a site like Amazon and sell itself. Of course, you can market it, too, but that's another story! Some sites let you keep most of the earnings, while others do not.
If you know anything well, a place, how to fix something, how to make something, how to do something, you can write a guide for it. You can sell your guide as an e-book, offer it as a download for a fee on your site or reach out to bloggers with similar content and ask if they will offer it as a paid download on their website (for a price of course).

According to Uncle Sam, you need to be "materially involved" in an enterprise to earn active income. With passive income, it's just the opposite, as the IRS deems you to be earning passive income if you're not materially involved with a profit-making enterprise. By and large, expect income to be taxable if you are engaged in a passive income enterprise. You will need to report earnings to the IRS.
My dad is in  a similar situation as we speak, things have not been going well for him at work (but I do think he has himself to blame) and seems likely he will get let go.  Mr. Budgets and I both see how our parents are and we totally want to be on the other end of the spectrum when it comes to how they handle money. It motivates us to save and invest even more.
The other point is that it is pretty easy to get started.  You don’t need to be super rich, and you don’t need a lot of time to get started.  To say it requires no time would be a lie, but you don’t need to make anything listed above your life.  You can work at your job, invest your excess income, save to buy a rental property or rent out a room in your current house, and you start a side job online without breaking a sweat.

-The second brother has set up his stall in a very busy market place. It required some more starting investment but the returns were even more rewarding. On days like 31st December and 1st January, he easily earns 40,000 rupees. He is also very active on Facebook. Social media marketing helps a lot. Zomato rating of his stall is 3.9, and clearly, his focus on quality and customer satisfaction has paid off. Average monthly income is somewhere between 1 lac to 1.5 lac rupees.

A lot of people these days are moving towards the two job concept. Amongst the people i know who have applied this in their life; the primary reason is that the 9 to 5 job pays their bills, lets the fire burning in the kitchen, and the second job is where their passion lies. This is the passion, which might have been forgotten while growing up, or is not a viable primary income source.
Let us start by creating a corpus to invest your money. Let us say you are 25 years of age and earning Rs.75,000 per month after completing your MBA. You can save Rs.10,000 per month in an equity fund as you have other commitments with the rest of the money. But starting off with Rs.10,000 per month in an equity fund SIP is not bad enough. Here is why.
As a private lender, you can lend to anyone in your social circle. For example, many home rehabbers need access to a source of capital they can tap into very quickly in order to fund the initial purchase of their properties. You can partner with a rehabber who uses your capital for a short-term in exchange for an interest rate that is mutually agreed upon.
It’s obvious, but every successful product solves a problem or fills a need- if the problem must be solved quickly, even better. What’s an urgent need? How about a car repair when you’re stuck on the side of the road (‘had the transmission on my car give out on a highway exit ramp. I don’t recommend it). Another good example is heat or air conditioning repair at home.

Excellent collection of ideas!!! As always, very nice write up. Also for people interested in teaching say you are good in some technology, you can go and drop your CV to any training institutes which teach that technology. Most of the training institutes these days do not have full time faculty working for them, its mainly people working for some companies coming and taking part time classes as a visiting faculty either during weekdays/weekends. You just need to go teach and get your pay which will be either in terms of per hour basis or per course basis. Very effective way, though I do not do it now, I had used this for quite some time and made some good money.
I’ve been researching a path to financial independence, and the wealth of knowledge here is amazing, but at times overwhelming. I’m honestly not quite sure where to start. Whether it be paying off debt (which I’ve always heard is priority 1), or sinking money into realtyshares or CDs for growth. I’d love to generate a passive income (in a few years time) to supplement some of my day job to have time to spend with my little one during her golden childhood years, but not sure if there’s even a right order to go about it.
Wouldn't it be nice to earn income without worrying about it? I'm not talking about doing your regular 9-to-5 job, but through passive income. Because, believe it or not, there are several easy ways to earn passive income. Yes, some of the ways may involve some work, time, and money up front, but once that's taken care of, you can sit back and watch your bank balance grow.

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.