Ask HN: Recommend me a course on Coursera

My university just provided us with free Coursera accounts until the end of summer. However, there's so many courses to choose from that I don't know where to start! Please recommend me a course that you liked, preferably from the following areas: - UX design - bioinformatics - statistics for data science - mathematical analysis - algebra or category theory But of course, you don't need to stick to those categories, I'd love to learn about anything new!