The black swan is coming, and the bear market is no longer a restricted area for financial management! This article provides in-depth knowledge about the unique two-way trading mechanism of Contracts for Difference (CFD), and analyzes how to use the "short selling" mechanism to make money against the trend in a cliff-like falling market. Discuss the underlying logic of high volatility as trading fuel, and guide novices on how to use the millisecond ordering system to copy the calm decision-making and risk control strategies of senior experts when others are fearful, and turn market crises into arbitrage opportunities for asset allocation.