One of the things I like to do in my spare time is watch history videos online. I like the ones that I can cue up and then do something else (e.g. cleaning) while listening to the narration. Audiobooks are also good for this. My first preference would be to just read about the stuff, but often I’m just too busy.
Strangely, some historical incidents–especially battles–have tons of videos made about them, and others have next to nothing. For instance, there are plenty of documentaries about the Battle of Marathon, but almost none about the Battle of Plataea.
What I was really looking for was something in-depth on the Battle of Tours. (Which is also sometimes called the Battle of Poitiers, which is confusing, because there was another Battle of Poitiers, some 600 years later. I know this because my friend P.M. Prescott wrote a short historical fiction story about it.)
Of course, there is an absolute wealth of material on World War II. It just never ends. I think its better documented even than more recent wars, especially Korea, the “forgotten war”.