Investor worries often arise during periods of market volatility. Some common mistakes investors make include failing to diversify their portfolio, not monitoring it regularly, having unrealistic expectations, and making emotional decisions rather than following a clear strategy. The best approach is to invest systematically over the long term and ignore attempts to time the market. Periods of pessimism often present good opportunities to invest in equities at low prices. Maintaining a balanced, diversified portfolio and staying disciplined can help investors weather downturns and achieve their financial goals.