每日钉一下（追踪同一个指数的指数基金有很多，该如何挑选呢？）

Group 1 - The article emphasizes that different regional stock markets do not move in unison, allowing investors to seize more investment opportunities by understanding multiple markets [2][3] - Global investment can significantly reduce volatility risk, highlighting the benefits of diversifying investments across different markets [2] - A free course is offered to educate investors on how to invest in global stock markets through index funds, aiming to share the long-term gains of global markets [2][3] Group 2 - When selecting index funds that track the same index, it is important to consider the expense ratio, as lower fee index funds tend to perform better on average [5] - The scale of the index fund also impacts returns; funds with a scale between 200 million to several billion can enhance returns through methods like IPO allocations, while larger funds may not see a significant relationship between scale and returns [6]