每日钉一下（什么是行业指数，投资时需要注意些什么？）

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, highlighting its significance in a diversified portfolio [2] Group 2 - The article explains the concept of industry indices, which focus on stocks within specific sectors such as consumer, healthcare, and finance [5] - It outlines the need to manage investment proportions in individual industries due to their higher volatility, which can average between 30%-50% annually, compared to broader indices like the CSI 300, which typically sees volatility around 20%-25% [5] - It advises investors to limit exposure to any single industry to 15%-20% to mitigate risk [5] - The article also stresses the importance of selecting strong industries for investment and ensuring a diversified allocation across different sectors [6][7]