Selling online courses is usually regarded as a lucrative way to make money online. However, there are two major issues, one, creating a course is really difficult, and two, selling a course is even more difficult. Creating a course is an elaborate process. You need skills in multiple disciplines. Selling courses requires skills in multiple disciplines as well. You can either sell through platforms like Udemy, Skillshare, etc., or through your own website. Interestingly, if you have somehow managed to create a course, you can run ad campaigns to generate sales.