According to the targets I focus on, they are mainly in the non-ferrous metals sector of U.S. stocks, including gold, silver, copper, aluminum mining stocks, and related ETFs. Choosing "which one is the best to buy" depends on your investment style (whether you prefer stability or high risk and high return), your judgment of the market trend, and your holding period. To help you make a decision, I will divide these targets into several tiers and analyze them: Tier 1: Stable (suitable for long-term allocation and risk-averse investors) These targets are usually industry leaders or ETFs composed of a basket of stocks, with strong risk resistance and relatively small fluctuations...