每日钉一下（哪些品种是固收+基金，我们该如何选择呢？）

Group 1 - The article emphasizes the importance of diversifying investments across different asset classes, including both RMB and foreign currency assets, as well as stocks and bonds [2] - It introduces a free course that systematically covers investment knowledge related to US dollar bond funds, indicating a growing interest in this area among investors [2] - The article highlights the rapid growth of "fixed income +" products in recent years, driven by declining deposit rates and increasing investor attention [7] Group 2 - "Fixed income +" funds typically add a small amount of stocks or convertible bonds to a pure bond base, leveraging the negative correlation between stocks and bonds to achieve stable returns while reducing volatility risk [5] - Traditional "fixed income +" products include primary bond funds, secondary bond funds, and mixed bond funds, with secondary bond funds and mixed bond funds being the most classic types [5] - The broader category of "fixed income +" also encompasses hedge funds and all-weather strategy funds, which may not hold a high proportion of bonds but use strategies to control volatility risk [5][7]