I want to talk about my experience with Udemy.
Anyone with a skill must first use it to his advantage so that it can become a source of extra revenue for him. YouTube was included. I tried often. Sadly, the experiment was unsuccessful. The material was pretty smooth on Udemy, where I visited. Additionally, dealing with pupils is reasonably straightforward. I started with one course with them and am currently in my eighth. The earnings are moderately decent.
Although it cannot be depended upon as a primary source of revenue, it makes an excellent supplementary income since, unlike YouTube, I do not need to regularly monitor the websites' algorithms for it to display in browsers constantly. Udemy will take care of the rest; all required is that the course has professional material and reasonable pricing.