I agree mostly with the real estate advice. I’m looking for ways to take advantage of the condo I own to get up the rent from ~$0.90/ft to the $1.2-1.5/ft that seems more like the range in the same area. I’d have to put in a bit of capital (probably 10k on the low end for just the basics up to 40k if I wanted to remodel the kitchen and 2 bathrooms up to par with the area), so the return is likely there if those upgrades warrant $1.30/ft (given the unit is larger than most 2br/2ba in the area).

"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.

He makes a strong case for network marketing and offers the difference between investing in say a franchise for hundreds of thousands as opposed to starting your own network marketing business, which is much like a franchise with a proven system only you can start with literally nothing down and use the leverage of people. Similiar concept as real estate with some of the advantages of franchising. No capital investment with huge returns.
Example. Jean Blanc, a citizen and resident of Canada, is employed as a professional hockey player by a U.S. hockey club. Under Jean's contract, he received $150,000 for 242 days of play during the year. This includes days spent at pre-season training camp, days during the regular season, and playoff game days. Of the 242 days, 194 days were spent performing services in the United States and 48 days performing services in Canada. The amount of U.S. source income is $120,248 ((194 ÷ 242) × $150,000).
The Indian rupee (₹) is the only legal tender in India, and is also accepted as legal tender in neighbouring Nepal and Bhutan, both of which peg their currency to that of the Indian rupee. The rupee is divided into 100 paisas. The highest-denomination banknote is the ₹2,000 note; the lowest-denomination coin in circulation is the 50 paise coin.[319] Since 30 June 2011, all denominations below 50 paise have ceased to be legal currency.[320][321] India's monetary system is managed by the Reserve Bank of India (RBI), the country's central bank.[322] Established on 1 April 1935 and nationalised in 1949, the RBI serves as the nation's monetary authority, regulator and supervisor of the monetary system, banker to the government, custodian of foreign exchange reserves, and as an issuer of currency. It is governed by a central board of directors, headed by a governor who is appointed by the Government of India.[323] The benchmark interest rates are set by the Monetary Policy Committee.
There are a lot of article sites out there that share revenue, but my favorite (and it’s where I earn most of my article writing income) is InfoBarrel, which you’re very familiar with if you’ve been following my blog for awhile.  If you’re up for a very ambitious challenge, you can read about the one I wrote for earning $2,000+ per month with article writing.  The top InfoBarrel writers currently earn at least $2,000 per month.
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.