Best Design & Creative courses
The 2 Design & Creative courses Redditors recommend to each other on Reddit, ranked by how many people recommended each one, how strongly, in how many separate threads and over how many years (8 recommendations). 1 of them are free. How ranking works.

#282Rising
Google UX Design Professional Certificate
Coursera · beginner · paid
One commenter says they've heard good things about it as a way to go into more detail on UX after an introduction to user-centred product design.

#678
Product Design
Udacity · beginner · free
Commenters point to it as a free starting point for UX and product validation, though one notes it runs longer than necessary.
Other topics
Machine Learning & AI (153)Algorithms & Data Structures (76)CS Fundamentals & Systems (49)Mathematics (60)Programming Languages (172)Web & Mobile Development (306)Databases & Data Engineering (17)Security & Cryptography (2)Science & Engineering (7)Productivity & Personal Development (4)Marketing & Growth (23)Business, Finance & Economics (45)Humanities & Social Science (2)General Learning (16)