Writing and publishing an eBook has become a widely popular means of earning passive income in recent years. eBooks on non-fiction topics like online marketing, business development, career advice, and the like are especially successful. While fiction eBooks are also good sellers, the market for them is much more competitive as compared to non-fiction ones. Once you've written an eBook, you can put it up for sale on platforms like Amazon's Kindle Direct Publishing or Apple's iTunes Connect.
I agree that it is important to establish multiple sources of income, but I would be hesitant to group dividend stocks and real estate into the “multiple streams” bucket. Those are investments, and living off of investment income because you are in an emergency state is not a good plan. Cash flow from investments ebbs and flows more than the cash flow from a day job.
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.
The biggest surprise is real estate being second to last on my Passive Income Ranking List because I’ve written that real estate is my favorite investment class to build wealth. Physical real estate doesn’t stack up well against the other passive income sources due to the lack of liquidity and constant maintenance of tenants and property. The returns can be huge due to rising rental income AND principal over time, much like dividend investing. If you are a “proactive passive income earner” like myself, then real estate is great.
Poverty rates in India's poorest states are three to four times higher than those in the more advanced states. While India's average annual per capita income was $1,410 in 2011 – placing it among the poorest of the world's middle-income countries – it was just $436 in Uttar Pradesh (which has more people than Brazil) and only $294 in Bihar, one of India's poorest states.
You might be thinking one job makes you exhausted by the time you come home from work, how can you create second, third, fourth one and work so efficiently for them. You have to find out ways of creating multiple sources that are suitable for you and can add steady flow of income in your monthly salary basket. It could be as low as INR. 100/- per month but has to be steady.

India has an underground economy, with a 2006 report alleging that India topped the worldwide list for black money with almost $1,456 billion stashed in Swiss banks. This would amount to 13 times the country's total external debt.[385][386] These allegations have been denied by the Swiss Banking Association. James Nason, the Head of International Communications for the Swiss Banking Association, suggested "The (black money) figures were rapidly picked up in the Indian media and in Indian opposition circles, and circulated as gospel truth. However, this story was a complete fabrication. The Swiss Bankers Association never published such a report. Anyone claiming to have such figures (for India) should be forced to identify their source and explain the methodology used to produce them." A recent step taken by Prime Minister Modi, on 8 November 2016, involved the demonetization of all 500 and 1000 rupee bank notes (replaced by new 500 and 2000 rupee notes) in order to return black money into the economy.[387][388]

Dividend Income: Dividend income is wonderful because it is completely passive and is taxed at only 15% if you are in the 25%, 28%, 33%, and 35% income tax bracket. If you are in the 39.6% income tax bracket you will pay a 20% tax on your dividends. My dividend income portfolio mainly consist of dividend equity and bond ETFs such as DVY, VYM, MUB, TLT, and IEF. Total stock and bond income is a little over $100,000 a year due to a heavy accumulation of stocks and municipal bonds after selling my house.
For a person working for a wage, their source of income is their job, or their labor (aka their time that they sell to someone). But you can own a house, and rent it out, and when your renters pay you renter every month, the source of that income check is your rental property, or your house. It would just be called rental income. If you have money in the bank in an account that pays interest, those interest payments are another source of income. We can say the source is interest payments, or we can identify the asset that is generating rent, and say your money in the bank that is generating “rent” (aka interest) is your source of income.