每日钉一下（三大消费指数，有何区别？）

Group 1 - The article highlights that most investors are familiar with stock index funds but have limited knowledge about bond index funds, indicating a gap in understanding investment options [1] - It introduces a free course that focuses on investment methods for bond index funds, suggesting an educational opportunity for investors [1] - The article encourages readers to engage with a course assistant to receive additional resources such as course notes and mind maps for efficient learning [2] Group 2 - The article promotes a larger family asset allocation course, indicating a broader context of financial education beyond just bond index funds [3]