@LiaFajarwati, Once you start creating your course, you can upload your videos, as well as how to add sections, lectures, and resources following the instructions in this help article.
Do you need guidance with anything else? We have many resources on how to create your promo video (the preview of your course) and structure your course landing page. Let me know if you'd be interested in learning more and I'll be more than happy to help. 🙂
Bella Almeida
Udemy Community
