PSA: Want to learn Game Design but don't know where to start? There are tons of free online courses out there
I was a heavy online courses user back on its day when Coursera, EdX and Udacity launched. Recently I revisited those sites to see if there was any new courses I could be interested in.
One of the things that surprised me was the number of courses, or even whole specialties about game development and game design that are there. Some examples are
https://www.edx.org/xseries/video-game-design
https://www.coursera.org/specializations/game-design
https://www.coursera.org/specializations/game-development
They are completely free and very easy to consume. If you are an aficionado and looking to get into game design, but don't know where to begin, these could be a nice starting point.
As a caveat, I can't vow for the quality of all of these courses. I checked out a couple of them and the quality differs quite a lot. Still, probably worth checking out.