每日钉一下（军工主题有啥特点，投资需要注意什么？）

Group 1 - Many investors start their investment journey with index funds [1] - There is a limited-time free course that introduces investment techniques for index funds [2] - To access the course, individuals can add the "Course Assistant" and reply with "Index Fund" to receive it [3] Group 2 - The course also includes notes and mind maps to help learners quickly understand the course structure and learn more efficiently [3] - There is an option to click and read the original text for a free large family asset allocation course [4]