From a risk perspective, usually mature large companies such as Alibaba have lower volatility and risk than start-ups because they already have a stable business model, revenue source and market position. However, "safety" is relative, and investing in stocks always carries risks. Even large companies like Alibaba are facing regulatory risks, market competition, macroeconomic changes and other factors. Although start-ups are riskier, they may also bring higher returns. Investment decisions should be based on your financial goals, risk tolerance and investment duration, and consider appropriate portfolio diversification. It is recommended to consult a professional financial adviser before making any investment decision.