Skillshare has 4 million students, so it is an extremely attractive marketplace to upload your courses to. It allows you to create a video course and an assignment or class project to it. The courses on Skillshare are really brief, so even people who don't have time can spare 10-25 minutes to learn.

Best online learning platform for teachers. You can create short educational videos (10 - 25 minutes) and combine your course this way. If you are a professional in something and ready to share specific skill with the world, it can be your perfect side gig. You can start earning with partner's program starting from 25 students to your course.