The obvious way to earn a second income is to get a part-time job. If you are not currently working, this is an excellent way to start as it gives you the freedom and flexibility to start other passive income opportunities.  The other option is to simply work from home full time which frees up commute time so you can focus on building more income streams.
Thank for this extensive work. When you make extra money you need to think simple. First thing you should consider is whatever you do must be safe enough that you don’t lose your initial investment as well. Also, look at the ways you can reduce your costs. This could be car insurance savings or paying back expensive loans or card balances. Saving is making money as well.
India ranks second worldwide in farm output.[citation needed] Agriculture and allied sectors like forestry, logging and fishing accounted for 17% of the GDP.[citation needed]The sector employed 49% of its total workforce in 2014.[152] Agriculture accounted for 23% of GDP, and employed 59% of the country's total workforce in 2016.[153] As the Indian economy has diversified and grown, agriculture's contribution to GDP has steadily declined from 1951 to 2011, yet it is still the country's largest employment source and a significant piece of its overall socio-economic development.[154] Crop-yield-per-unit-area of all crops has grown since 1950, due to the special emphasis placed on agriculture in the five-year plans and steady improvements in irrigation, technology, application of modern agricultural practices and provision of agricultural credit and subsidies since the Green Revolution in India. However, international comparisons reveal the average yield in India is generally 30% to 50% of the highest average yield in the world.[155] The states of Uttar Pradesh, Punjab, Haryana, Madhya Pradesh, Andhra Pradesh, Telangana, Bihar, West Bengal, Gujarat and Maharashtra are key contributors to Indian agriculture.

"That's certainly true for entrepreneurs, but even for people who work inside a company, cultivating a side income stream of some sort — whether it's having an Etsy store on the side, or doing a little bit of coaching or having a workshop now and then, whatever it is, doing a little bit of paid speaking — having that sideline gives you additional protection against uncertainty and also has a lot of other benefits.

Indian economic policy after independence was influenced by the colonial experience, which was seen as exploitative by Indian leaders exposed to British social democracy and the planned economy of the Soviet Union.[110] Domestic policy tended towards protectionism, with a strong emphasis on import substitution industrialisation, economic interventionism, a large government-run public sector, business regulation, and central planning,[118] while trade and foreign investment policies were relatively liberal.[119] Five-Year Plans of India resembled central planning in the Soviet Union. Steel, mining, machine tools, telecommunications, insurance, and power plants, among other industries, were effectively nationalised in the mid-1950s.[120]
India has a fast-growing medical tourism sector of its health care economy, offering low-cost health services and long-term care.[256][257] In October 2015, the medical tourism sector was estimated to be worth US$3 billion. It is projected to grow to $7–8 billion by 2020.[258] In 2014, 184,298 foreign patients traveled to India to seek medical treatment.[259]
This equation implies two things. First buying one more unit of good x implies buying {\displaystyle {\frac {P_{x}}{P_{y}}}} less units of good y. So, {\displaystyle {\frac {P_{x}}{P_{y}}}} is the relative price of a unit of x as to the number of units given up in y. Second, if the price of x falls for a fixed {\displaystyle Y} , then its relative price falls. The usual hypothesis is that the quantity demanded of x would increase at the lower price, the law of demand. The generalization to more than two goods consists of modelling y as a composite good.
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5. Make sure you are properly diversified. Capital preservation is underrated. We saw a lost decade for tech stocks between 2000 and 2010 after the first dot-com bubble burst. It actually took 13 years for Nasdaq investors to get back to even. Investors in the Borsa Istanbul stock market index just gave up 10 years' worth of gains after they saw a plunge in their currency, partially due to increased tariffs by the US and a lack of confidence in the government. Your passive income needs to be properly diversified in order to take the hits.

Unfortunately, I can’t answer that conclusively one way or the other. It all depends on you, what you like to do, your work ethic, personality, etc. If you are a good writer perhaps you could write a book and make money that way. Or, you could start your own website and do affiliate marketing. Just because you are young it doesn’t mean you can’t make money doing at least a few of these ideas. I wish you luck in your money making efforts!

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.