I think this is probably the most useful wisdom for the average person:

> do not invest money you need within 5-10 years and do not make rash decisions; it is better to ride this train down and then hopefully back up than jump randomly.

Gaming the market successfully requires a ton of skill and knowledge, and even then you are not guaranteed success.

Most people are better off focusing on asset-class diversification (i.e. spreading money across many different kinds of asset classes - i.e. physical assets, securities, commodities, cash, etc) than playing just the stock market.

And even when playing the stock market, most people are better off focusing on "time-in-the-market" vs "timing the market".