Nice, gentle, but challenging course for absolute beginners in UI design. The videos are very nicely done and looking at the design, these are videos that wouldn't get stale in a few more years.
Some design background helps, but if you're not a designer, you could probably ramp up to speed by looking at others' works and reading free online article yourself. I find it very beneficial that I could take and retake tests as often as needed, as the peer feedbacks given are very useful. I used a free vector software called Inkscape throughout this course, and also Google Slides to build the PDF files.