Investors need to flexibly respond by combining technical and fundamental analysis. For example, in gold, attention can be paid to support levels to layout long positions (such as $2890-$2895), while for oil, one should wait for a rebound before taking short positions; for US stocks, it is advisable to diversify risk and focus on industries with steady profits during earnings season. Quantitative trading systems can partially avoid emotional interference, but one must be cautious of the risk of overfitting historical data.