Udemy combines the best of both worlds and offers a robust selection of online interior design courses for both professionals and beginners, which can be taken at your own pace on any device. In addition to multiple interior design courses, you can take classes on web development, digital marketing, business analytics, and more. It was founded in 2009 in California to provide adults and students with interesting, easy-to-use course content and it now has more than 180,000 courses available. Udemy offers affordable self-paced online courses in interior design for both professionals and hobbyists with loads of topics to choose from.