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40k is crazy good
(hexbear.net)
Tabletop, DnD, board games, and minecraft. Also Animal Crossing.
3rd International Volunteer Brigade (Hexbear gaming discord)
Rules
How do you even get into the lore? Wiki or books or playing the game?
Do add to this, there are some good Youtube chanels that do 40k Lore.
My advice would be to download the PDF of the latest full rulebook and read the lore section. It's written as an introduction and will give you a high level overview of the factions and settings. Then, read the lore sections of any factions you find to be particularly interesting, or find a novel involving them.
I always found 40k to be incredible impenetrable when I only had a vague idea of it's existence. I only really got into it after watching a few of these videos here: https://www.youtube.com/watch?v=M6M9-oFEKpk&list=PLl6BRvEJ-auZ5aYPHj1B3pKJ_pLjg9qNU
I just listen to Youtube videos in the gym
I got into it by playing video games (Dawn of War, Dawn of War 2, Space Marine) and reading books (Ciaphas Cain, The Infinite and the Divine, I think some of the Horus Heresy books are good).
I'd say lore youtubers like Arbitor Ian are pretty decent.
Read dune, foundation, starship troopers, and the Judge Dredd comics. Those are the essential books in the GW canon (Because they stole everything from people who were actually literate).