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Trading strategies are key to earning profits and controlling risks in investing. Trend-following strategies can profit in a one-sided market but may easily backfire in a volatile market; mean-reversion strategies operate in the opposite direction when prices deviate from the mean, suitable for sideways markets but challenging to handle trend changes; arbitrage strategies capture price differences to obtain low-risk returns, but opportunities can be scarce. Investors need to reasonably mix and flexibly adjust strategies based on risk preferences, market conditions, and other factors.