I'm no expert but I have read some good books on it the last few years.
I don't know many documentaries (and am generally skeptical of them) but The World At War is a classic, though probably very outdated by now.
There is a pretty big reading list here on the /r/AskHistorian subreddit, written up by actual historians. So for any topics you're interested in, go check there.
If I was to tell someone to read any single book it would probably be "How the War Was Won: Air-Sea Power and Allied Victory in World War 2", which is a deep dive into what the main combatants were actually producing. I'd always assumed things like tanks were one of the biggest production topics, but for most countries they were actually just a few percent of overall production. Aircraft, anti-air defense guns, and ships were actually the biggest production items. He also goes into the imporance of boring things like aircraft lost outside of combat due to crashes, which gutted the German and Japanese air forces late in the war.
Adam Tooze's "The Wages of Destruction" is a good deep dive into the economy under the Nazis. It gets a bit bogged down on things like pre-war German agricultural theorists (yawn) but busts a good number of myths like the Germans not being under a serious war economy, and it explains pretty starkly why the Nazis carried out the Holocaust.
Most books by David Stahel and David Glantz seem to come highly recommended. Both importantly are writing after the opening of the Russian archives. For decades after the war, most of what the west knew about the Eastern front was what the German generals told us, and what was found in the German archives. This obviously led to a pro-German bias among most accounts written until the end of the Cold War.
I also finished Sean McMeekin's "Stalin's War" a few months ago. He's less focused on the fighting and more on the diplomatic maneuvering before and during the war, and does a pretty good job showing Stalin was a primary instigator who seems to always get off lightly for invading Poland, the Baltic states, and Finland while supplying Germany in 1939. Some of his more radical points seem to go a bit far, but even if you only agree with him 50% of the time, it seems that Western leaders were severely naive in their dealings with Stalin.
"A Tower of Skulls: A History of the Asia-Pacific War (July 1937-May 1942)" both goes through the Sino-Japanese War, and connecting it to events elsewhere which help to explain the happenings of the early stages of WW2. Particularly the latter part helps tie the interactions between Japan-China to the Soviet Union, America, and Germany beyond that.
If naval warfare is your thing, read Ian Toll's Pacific War Trilogy. It goes from the start of US involvement in 1941 through mid 1942 (first book), then through the middle of the war through the Battle of the Philippine Sea (second book), then to the end of the war in 1945 (third book). It does somewhat become a list of naval airstrikes and invasions. The focus is on the fighting, though it does tie in some US domestic politics.
If naval warfare is really your thing, then "Shattered Sword: The Untold Story of the Battle of Midway" and "Neptune's Inferno: The US Navy at Guadalcanal" are both excellent, both much more focused on one/a few battles than broader events, but illustrating both in great detail.
@centrally-unplanned and @gpuzzle might have some other recommendations too.
