I haven't watched much Hollywood output in years. It's almost strange to me that anyone would pay for Hulu or whatever, when youtube is so much better. You can learn about any subject you can think of. If you do want an hour of disposable entertainment before bed or whatever, there are tons of classic TV shows and movies to choose from and many talented youtubers who just do light entertainment.
So, I could spam this thread endlessly. But here are a few channels I like on various subjects.
There are a number of good channels about classical music, including The Classical Nerd and Samual Andreyev. There is a hugely popular one called 2 set violin, which is often good but often a bit too memey and maybe more for younger people. At the other end, Tonebase has super in depth videos often featuring big names and geared a bit more to people who actually play this stuff. But I think the best produced and most accessible is by a working British composer named David Bruce.
For history, often the best thing to do is just find real documentaries. I like the BBC stuff with Mary Beard and Lucy Worsley, who are respected historians. You have to be careful with subjects like this, as there is no shortage of crackpots or just sloppy amateurs. But a fun, strictly youtube channel is Max Miller's Tasting History, in which he prepares dishes from various historical periods and fills in the history surrounding them. It's extremely popular, but I'm sure some people don't know about it.
Somewhat similar, but these people are more into historical reenactments.
Best baseball channel is Foolish Baseball.
Religion/religious history seems to be an unusually well developed field in youtube/podcast world, with many top academics creating content or doing interviews including Tabor, Paigle, Goodacre and others. I like Ryan Reeves, who is a Christian teaching at a seminary or something like that. If you ever want to know about Quakers or Presbyterians or whatever he has a nice hour long video on it. Misquoting Jesus is really a podcast by famed NT scholar Bart Ehrman but it' on youtube. History Valley is interviews with various scholars, though he sometimes interviews people who are more fringe.
That's all mostly Christianity related, but I really enjoy this channel by a religious studies PhD student who covers all different types of religion. Did you know there's a religion based around John The Baptist?
I guess that's enough for now.