Group 1 - The article emphasizes that different regional stock markets do not move in unison, allowing investors to seize more investment opportunities [2] - Global investment can significantly reduce volatility risk, highlighting the benefits of diversifying across various markets [2] - A free course is offered to educate investors on how to invest in global stock markets through index funds, aiming to share the long-term gains of global markets [2][3] Group 2 - The article discusses that while short-term market fluctuations are unpredictable, valuation levels can be assessed to determine whether an asset is overvalued or undervalued [5][6] - It suggests using specific financial metrics such as price-to-earnings ratio for stable earnings, price-to-book ratio for stable net assets, and PEG ratio for growth stocks to evaluate investment opportunities [6] - The article advises investors to buy during undervalued phases and to hold or sell when assets become overvalued [6]