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Most of the more popular courses have discord or slack where you can work with other participants. A lot of the CS courses have automated the grading of problem sets. CS50 uses GitHub to submit and grade assignments, for example. There were a lot of frustrating moments for sure but I definitely spent a lot more time with the material and learned a lot more than I would have if I had been given more "support" like you get in a typical classroom. There's definitely a tradeoff. It worked great for me but I had a genuine interest in the topics. I'm also 32. I don't think for a second I could have managed to get as much out of MOOCs as an 18-22 year old.
A minor complaint given that the superb education cost me exactly $0.00 but there are a lot of really good free courses available but you have to hunt for them. For example Paul Hegarty teaches a really great introductory course on developing for iOS with Swift and it's freely available to everyone but it's not listed on Standford's online catalog and the iTunesU version is woefully outdated. The latest version[4] is available on YouTube and even has a dedicated website. I can't even remember how I found the newer course. I also stumbled across "The Ethics of Technological Disruption"[5] by looking at Stanford's YouTube channel playlists. Like the Swift course, it wasn't listed in the university's catalog of free courses.
All that is to say, it's entirely possible, if you're willing to put in the effort not only once you're in the class, but sometimes just to get there as well.
[1] https://ocw.mit.edu/index.htm
[2] https://cs50.harvard.edu/x/2020/
[3] https://online.stanford.edu/search-catalog?free_or_paid%5Bfr...