I have only a token investment in the stock market, since I've been burned in the past. I loaded up on tech stocks just before the dot.com bust (strike 1); I bought mutual funds just in time for the Dubya recession (strike 2), and I made some more mutual fund buys as the bailouts began (strike 3). It was a slow-moving disaster.
The market is completely irrational and stock prices have no relationship to the values of companies or their financial prospects. Case in point: during the abovementioned bailout period, I anticipated that Ford Motor Co would receive massive bailout funds, so I bought 1000 shares at 8 1/2. The bailout was approved--and the stock immediately fell below 2. Irrational!
Today is another example. Stocks tanked because of hedge fund activity and short positions being covered. What does that shit have to do with the value of stocks? Yet, if your timing was bad, you lost money. It's as if what is being traded is Bitcoin or tulip bulbs---little or no intrinsic value. The stock market is like a casino in a fun house.
Add to that the unhinged freakouts about individual stocks, and you have to conclude that you might as well just close your eyes and throw darts at the Wall Street Journal stock pages than try to make any kind of informed decision re investments, The wise guys and the big players know so much more than you do, anyway.