How can someone leverage their skills and expertise to create and sell online courses for profit?

There are a number of platforms that exist where you can leverage you skills and expertise, provided you want to have a one-to-many experience. In other words, there is 1–1 coaching in which you meet with individuals or small groups, or you can create an online course on a platform like Kajabi, Udemy, or your own site. The advantage to the more popular sites are they do walk you through building one, payments, etc. and people come there to learn, so when they search they can find your course. The downside is, if you are trying to do something many others are doing, yours might get lost. Good luck!