The speaker, who has successfully generated millions online, emphasizes the stock market as a key source of passive income. He explains that investing in the stock market, particularly through index funds like the S&P 500, can be a simple and effective way to earn passive income. The speaker highlights the concept of dollar-cost averaging, which involves regularly investing a fixed amount regardless of market conditions, as a strategy to maximize returns over time. He also discusses the importance of building active income streams, such as online businesses, to fund these investments. By using platforms like AliExpress, individuals can create online stores that sell products without handling inventory, thus generating income that can be reinvested into the stock market. The speaker stresses the importance of a long-term mindset and warns against expecting quick results, noting that building both active and passive income streams requires patience and persistence.