Online learning platforms are great for picking up new skills or improving existing ones. However, when you're choosing a course it is important to check the quality of the course. Many platforms offer courses created by regular users. For example, I could easily create my own course and put it on Udemy. With a few ad campaigns, I could generate sales. However, quality of these courses can be doubted. That's why you should be cautious about enrolling in courses on platforms that offer user-generated content.