After a sharp rise the past few years, the stock market has had a rocky start to 2025. Concerns that President Donald Trump's tariff policies could send the economy into a recession have extended the declines for the major market indexes over the last few weeks. The tech-centric Nasdaq Composite (^IXIC -0.18%) has fallen more than 10% year to date at the time of writing. A market sell-off can be unsettling, but also work to your advantage. Warren Buffett got rich taking advantage of periods when strong comp ...