I mean, you could just get a recent textbook introduction for undergrad students such as Brett Walker's Concise History of Japan (2015) or Nancy Stalker's Japan: History from Classical to Cool (2018)?

Either one's fine to get your feet wet.

There's also several more overviews that restrict themselves on specific periods (e.g., the modern period) and explore that in-depth, if the interest is a bit more focused. The standard work here would be Andrew Gordon's A Modern History of Japan: From Tokugawa Times to the Present, although there's quite a couple more on the market (and, again, for starters, any is fine).

There's no good documentaries that I'd know of, unless, probably, in Japanese (which isn't really helpful for obvious reasons). The netflix one about Sengoku Japan, for example, was - justifiedly - bashed pretty hard.

Once we become more specific with topics, there's much more that can be suggested (and, of course, there can be more said about the respective contents and flaws).