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User Experience (UX): The Ultimate Guide to Usability and UX
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Very good course (teaches UX from fundamentals): https://www.udemy.com/course/ultimate-guide-to-ux/
Currently it costs $75, but Udemy often has coupons/promotions for up to 95% off (I registered for $15). This course is normally $5000+. It is very thorough and well-explained. Like 20+ hours of video lectures, slides and full transcripts. Also the instructor is very responsive and active in the course's private FB group.
This course is shorter and more focused on web UI (vs more general UX): https://keynotopia.com/ux/
You can probably find resources for free, but then you might end up paying with your time. If you're really strapped for cash, I suggest borrowing books from the library: free and probably better than a lot of the low-cost/free resources online.
Don Norman's is one of the most respected UI/UX researchers. His book is used to teach UI at universities: https://www.amazon.com/Design-Everyday-Things-Revised-Expand...
Don Norman also contributed to Apple's HIG, which is actually a very good free online resource: https://developer.apple.com/design/human-interface-guideline...
There might also be some good open courseware like this: https://ocw.mit.edu/courses/electrical-engineering-and-compu...