Udemy is the largest global online platform where you can learn and teach multiple courses according to your will. They have launched their application too. It has more than 130,000 online courses with a variety of topics. You can learn on your own schedule with lifetime access. Their top categories of courses include design, IT and software, marketing, development, music, photography, business, drawing, ethical hacking, photoshop, python, machine learning, cyber security, personal development and many more. They have more than 35M learners, 57K instructors in more than 65 languages.