每日钉一下（老登股、大烂臭、三傻，都是啥意思？）

Group 1 - The article discusses the concept of different stock markets not moving in tandem, suggesting that understanding multiple markets can provide investors with more opportunities [2] - It emphasizes that global investment can significantly reduce volatility risk, highlighting the importance of diversifying investments across different regions [2] - A free course is offered to teach methods for investing in global stock markets through index funds, along with supplementary materials like course notes and mind maps [2][3] Group 2 - The article introduces various terms used in the A-share market to describe stocks that have underperformed, such as "old Deng stocks," which refer to stocks that have seen little price increase recently [4][10] - It explains the historical context of terms like "big rotten stinky" and "three fools," which were used during different market cycles to describe underperforming stocks compared to their high-performing counterparts [6][9] - The article notes that market trends are cyclical, and when certain assets are undervalued or overvalued, it presents opportunities for investors to buy low or sell high [14][15]