The Tax Foundation is the nation’s leading independent tax policy research organization. Since 1937, our principled research, insightful analysis, and engaged experts have informed smarter tax policy at the federal, state, and local levels. We improve lives through tax policy research and education that leads to greater economic growth and opportunity.

Stock dividends: Some stocks, especially stocks from big corporate standouts, pay dividends to shareholders based on the number of shares they own, and the percentage of the stock price on the dividend date. For example, if a company pays out 3% on a stock that's trading at $100 per share, you'll earn $3 for every share of that stock you own. Add it up and that can be good take-home pay as a passive investment.
You can make money whichever way floats your boat. I got a lot of slack in this post for trading forex, but I live in one country, and need currency from three other countries where I own property and travel to often, so when one currency is cheap, I do take advantage of fluctuations. It may not be your thing, but the important part is that you have more than one source of income.
From reportable Connecticut Lottery Winnings. Winnings from the Connecticut Lottery, including Powerball, are reportable if the winner was issued a federal Form W-2G by the Connecticut Lottery Corporation. In general, the Connecticut Lottery Corporation is required to issue a federal Form W-2G to a winner if the Connecticut Lottery winnings, including Powerball, are $600 or more and at least 300 times the amount of the wager.  See Informational Publication 2011(38), Connecticut Income Tax Treatment of State Lottery Winnings Received by Residents and Nonresidents of Connecticut
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.