There's a good podcast called Elder Scrolls Lorecast that goes over the various regions, guilds, characters, etc in pretty good depth. They've been around for a while so there's a lot of good content to listen to.
The Elder Scrolls
The Elder Scrolls (commonly referred to as TES) is an award-winning series of roleplaying games created by Bethesda Softworks. Set in the vast world of Nirn, The Elder Scrolls series is renowned for the level of unprecedented control given the player over his or her character's destiny, establishing itself as the benchmark in immersive, independently-living worlds for the RPG genre.
RULES:
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Off-topic discussion (Included but not limited to irl politics, religion, real world issues) is banned. You can discuss it to a light level in the comments, if it's in relation to the games.
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NSFW is not allowed.
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As far as I know, the general consensus on r/teslore was that all of ESO is canon, and that it does a decent job of expanding on existing lore. Back when I was doing more theory-crafting, I remember it had some great lore about orc society!
UESP has an ESO section and lots of lore in general so it’s a good place if you want reading material.
UESP and the Imperial Library for sure
Hey late comment but if you want a podcast the covers more of the high level things or explaining "deep lore" (What's is the Uutak Mythos, what is C0DA?) Try Written In Uncertainty by Aramithius, lovely podcast
UESP has a pretty decent app that has become a go-to read on commutes, etc
UESP is an incredible resource for everything Elder Scrolls. It's probably the best unofficial videogame website of all tbh