Group 1 - The U.S. stock market is diverse, encompassing various industries, company sizes, and styles, providing a wide range of investment options [1] - Different sectors and stocks may perform significantly differently under various economic cycles and market conditions, with cyclical industries potentially excelling during economic expansions and defensive sectors showing resilience during instability [1] - Risk assessment is crucial in U.S. stock investment, requiring consideration of macroeconomic factors like global economic conditions, U.S. GDP growth, inflation rates, and interest rates, as well as microeconomic factors such as company performance, financial health, and competitive landscape [1] Group 2 - Familiarity with trading rules is essential, as they affect trading operations, costs, and risk management; understanding trading hours, holiday schedules, and mechanisms like short selling is important for investors [2] - Timely and accurate information is fundamental for making informed investment decisions, necessitating the collection of various data sources, including financial reports, executive statements, and industry research [2] - Effective analysis methods, such as fundamental analysis for assessing company value and technical analysis for understanding price trends, are vital for investors in the U.S. stock market [2]