Udemy

Udemy is a vast marketplace with over 200,000 on-demand video courses across virtually every topic, from programming and business to hobbies. Key features include lifetime access to purchased courses, Q&A sections, and downloadable resources.

It serves individual learners looking for specific, practical skills at their own pace and businesses via Udemy Business. Courses are individually priced with frequent sales. It ranks highly due to its immense breadth, affordability, and practical focus. The open instructor model fosters diversity but varies in quality, though robust review systems help users find excellent content.