Conventional wisdom says that what goes up must come down. But even if you view market volatility as normal, it can be tough when your money is at stake. Although there’s no foolproof way to handle the swings, the following common-sense tips can help: Don’t put all of your eggs in one basket -- Diversifying your investment portfolio is essential, because asset classes often perform differently under varying conditions. Spreading them across stocks, bonds, and cash alternatives can help reduce your overall risk. Focus on the forest, not the trees -- Try not to become too concerned about day-to-day returns…