每日钉一下（中证A500所属的A系列指数，是啥意思呢？）

Group 1 - The article discusses the importance of diversifying investments across different asset classes, including both RMB and foreign currency assets, as well as stocks and bonds [2] - It highlights the significance of USD bond funds as a crucial component of investment diversification [2] - A free course is offered to provide systematic knowledge on investing in USD bond funds, along with supplementary materials like course notes and mind maps for efficient learning [2] Group 2 - The article explains the concept of the CSI A500 index, which belongs to the A series of indices, and its classification into several major types [5] - It points out the drawbacks of market capitalization-weighted indices, such as increased index risk due to short-term speculative companies and high concentration in certain industries [5] - The A series indices incorporate two strategies: broad-based indices and strategy indices, along with industry and thematic indices to enhance long-term returns [6]