Consider investing in low-cost, diversified exchange-traded funds (ETFs) to spread risk with your $100. ETFs track market indices, providing broad exposure to various stocks. Focus on long-term growth and avoid frequent trading to minimize transaction costs. Additionally, stay informed about market trends and company fundamentals. Diversification and patience are key for small investments, aiming for gradual wealth accumulation over time. Consult financial experts or conduct thorough research before making investment decisions.