每日钉一下（为什么说波动是把双刃剑？）

Group 1 - The article discusses the lesser-known concept of bond index funds compared to stock index funds and offers a free course on how to invest in bond index funds [2] - It emphasizes the importance of understanding investment methods for bond index funds and provides additional resources like course notes and mind maps for efficient learning [2] Group 2 - The article explains that volatility can be a double-edged sword for investors, where experienced investors can benefit from high volatility by buying at extreme lows and selling at extreme highs [6] - It uses the example of Moutai, which had a price-to-earnings ratio below ten during its lowest valuation ten years ago, and highlights the potential for significant gains during bull markets [6] - Conversely, inexperienced investors may suffer greater losses during high volatility, as they tend to buy at market peaks and panic sell during downturns [6][7]