Monitor your investments. When the stock market is gyrating, it's tempting to sell stocks out of fear or buy them out of greed.
If you are long-term investor with a well-diversified portfolio and are comfortable with your allocation among stocks, bonds and short-term investments, there's no reason to be making any big changes.
If you are not comfortable, not diversified or need the money in the next year or two, take advantage of up days in the market to rebalance your portfolio.
Duly noted, in light of my handwringing on Tuesday.