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While not exclusively "interior design," this is the cornerstone course for serious learners. It teaches you to "think like a designer." You learn about: coursera interior design
For those who want to bridge digital tools with physical space, this course is a gem. It moves beyond mood boards into prototyping. You learn how to use digital fabrication tools (conceptually) and model making to test your design ideas before buying a single piece of furniture. Disclosure: This article is for informational purposes