Group 1 - The core idea is that retiring as a millionaire is achievable for many Americans with discipline and smart investment strategies [1] - Starting early is crucial; investing $100,000 with a compound annual growth rate (CAGR) of 6% over 40 years can yield over $1 million [3][4] - Diversifying investments reduces risk; a portfolio should ideally include at least 25 stocks across various industries [5][6] Group 2 - Investing in funds like mutual funds can provide diversification, but they may come with high fees and limited control [7] - Exchange-traded funds (ETFs) offer a low-cost way to diversify across various assets and can be traded like stocks [9] - Closed-end funds (CEFs) trade on stock exchanges and can invest in less liquid assets, but they may involve higher risks due to leverage [10]