每日钉一下（投资美债，选择这些品种，更稳妥）

Group 1 - The core viewpoint is that investing in active funds essentially means investing in fund managers, highlighting the importance of selecting the right manager in a market with thousands of options [1] Group 2 - There is a limited-time free course offered that introduces investment methods for active funds, indicating an opportunity for investors to enhance their knowledge and skills in this area [2]