Historia Civilis—excellent history videos. Primarily their story of the fall of the Roman Republic, which does a shockingly good job of making you feel emotions for a little coloured square with the channel’s iconic simple animation style. Good if you’re interested in the intricacies of the politics and culture of the time.

Extra History—shorter historical overviews of a much wider range of topics than the above. Quite transparent about their process with their “Lies” episodes at the end of each series, where they explain any errors that slipped through, as well as aspects they left out for the sake of keeping the story focused within the time they had.

ReligionForBreakfast—a scholarly, secular take on religion and religious practice. I think the first thing I saw was their series on American Civil Religion, which is the idea that Americans’ attitude towards their country and its processes is similar to religion belief and practice.

UsefulCharts—history and religion, told through charts. The ones that interest me the most are the ones that touch on the creator’s PhD in religious studies, such as about the historicity of various aspects of the bible, and on his actual thesis topic on the Psychology of Atheism.

And since you said “informative”, I’ll add some that I probably wouldn’t have included solely under the “educational” category. Not Just Bikes, CityNerd, Radical Planning, Oh the Urbanity!, among others. Urbanist channels across a range of the political spectrum (from Oh the Urbanity which are relatively libertarian, to Radical Planning which is quite marxist). But all of them deal with the problems inherent to the way cities are designed especially in the anglosphere (and among that, especially in America) and how car-centric design creates miserable places while also being economically ruinous.