Passive income: NO

Earning passive income from selling class notes is challenging and unlikely for most people. While some may automate the process by creating a website or using platforms like Etsy or Gumroad, the initial effort to create high-quality notes and market them is significant. Most people do not reach a truly passive level of income, as continuous updates and marketing are often required. Only a few outliers, who manage to build a large audience or niche market, achieve passive income. Many fall for the myth that simply uploading notes will lead to sales without ongoing effort. Realistically, it becomes passive for those who can leverage technology and have a strong, consistent demand for their notes, but not for the majority who lack these advantages.