I help with podcasts at Substack. Substack is a podcast-hosting platform like the others you describe (although in my biased opinion we have a number of other great features that set us apart). Most of the podcasts on Substack are hosted and distributed by Substack. A few Substack podcasts do point back at other platforms, but this isn't the norm.
Writers can embed youtube videos in their posts. When they do, those are hosted on youtube.
I started using this in beta; I now use it for virtually every site that I go to regularly. It is a great supplement to the omnibar, but it doesn't change on you based on your search history. This makes browsing more consistent.
That looks great, I hadn't heard of that one. I knew bro did something similar.
Cheat looks similar to eg, but I would argue that eg is prettier, with `man`-style default coloring and the ability to customize the colors to whatever scheme you want. eg includes a more usable explanation rather than pure examples. It also takes a "create your own examples" approach, while cheat seems to take more an "edit your own examples" approach. You can do both with eg, but the general idea is that you would leave the defaults as is.
Still, cheat is a great link. I should probably add a "similar tools" section to the eg readme.
Occasionally I'll come across a github project, realize it is exactly what I've been looking for, and then see that it has thousands of stars and everyone already knows about it. This collection should give you a good place to start looking for useful and popular tools, especially if you're new to a language.
Writers can embed youtube videos in their posts. When they do, those are hosted on youtube.
However, Substack also has our own hosted videos (see https://on.substack.com/p/video-on-substack).