Group 1 - The article discusses the importance of understanding index funds for investors starting their investment journey, emphasizing the need for effective investment strategies to achieve good returns [2] - A free course is offered to teach investment techniques related to index funds, along with supplementary materials like course notes and mind maps for efficient learning [2] Group 2 - The article highlights the performance of the Shanghai Composite Index compared to other indices, noting that the Shanghai Composite Index rose from 2440 points in 2019 to 3731 points in 2021, a 52.9% increase [6] - In contrast, the Shenzhen Component Index increased by 132% and the ChiNext Index surged by 202% during the same period, indicating that the performance of stocks on the Shenzhen and ChiNext exchanges significantly outperformed the Shanghai Composite Index [7] - The article suggests that relying solely on the Shanghai Composite Index can lead to misleading conclusions, especially during growth-oriented bull markets, and recommends considering the overall performance of both Shanghai and Shenzhen markets through the CSI All Share Index [7]