In case you already have a website, a blog, or even a social network account, you can start selling online courses using your existing tools. However, you might face a number of challenges along the way. Dealing with payments, marketing, and keeping track of sales are just a few. That’s why using a platform that is specifically designed for selling courses and can handle all these tasks may be a more workable solution. The most popular platforms include iSpring Market, Udemy, Teachable, Thinkific, and Kajabi.