Successful investors like stocks better when they’re going down. When you go to a department store or a supermarket, you like to buy merchandise on sale, but it doesn’t work that way in the stock market. In the stock market, people panic when stocks are going down, so they like them less when they should like them more. When prices go down, you shouldn’t panic, but it’s hard to control your emotions when you’re overextended, when you see your net worth drop in half and you worry that you won’t have enough money to pay for your kids’ college.

Over the long run, the crowd is always wrong.

Right at the core, the mainstream has it backwards. Warren Buffett often quips that the first rule of investing is to not lose money, and the second rule is to not forget the first rule. Yet few investors approach the world with such a strict standard of risk avoidance.

The trick of successful investors is to sell when they want to, not when they have to.

It is crucial to have a strategy in place before problems hit, precisely because no one can accurately predict the future direction of the stock market or economy. Value investing, the strategy of buying stocks at an appreciable discount from the value of the underlying businesses, is one strategy that provides a road map to successfully navigate not only through good times but also through turmoil.

If an asset has cash flow or the likelihood of cash flow in the near term and is not purely dependment on what a future buyer might pay, then it's an investment. If an asset's value is totally dependent on the amount a future buyer might pay, then its purchase is speculation.

Be sure that you are well compensated for illiquidity - especially illiquidity without control - because it can create particularly high opportunity costs.