90. Online Courses – there are a number of online courses available for purchase at sites like Udemy. While programming and information technology topics tend to get the most traffic, there are a wide variety of other course topics available on topics like music, happiness, or brand building.
For the course creator, the courses represent a recurring income stream that requires little to no effort after spending a lot of time upfront to create the course.
Even someone who had nothing unique to teach the world can make money on online courses by buying that course creator’s future earnings stream from a course.