I'm not sure I have any itches big enough to scratch yet, but I'm curious about the platform. Most of my programming experience is on the desktop and not with web technologies, though I know some of the basics. So I thought I'd do some researching on the underlying technologies. Usually, I'm more of a book learner, but I found a sale on Udemy where all their courses are $11.99 (USD) so I thought I'd mention them now as the sale ends today (the $11.99 price seems only available on the mobile apps, iOS & Android). I may post some book links later.
There are many classes on each topic to select from. Here are just a few I picked out based solely on the number of reviews and the review rating:
Are there any other topics that are useful to research? Any recommendations on books, video courses, etc? Idioms & style references?