

The best way I’ve discovered 40k lore beyond hearing from a friend and some meme is Luetin09, which has a great narrator voice, consider his channel a huge audio library of alleged facts and stories.
How to make a space Marines: https://youtu.be/whtHtyAy0Wo
Also, I heavily recommend Arbitor Ian as he has both a nice presentation style, and also talks about the meta aspects (like how things evolved in the 40 years of 40K lore changing)
The timeline of 40k in 20mn: https://youtu.be/05YRMHWtv1Y
That cute dog looks so good I decided it’s my phone wallpaper now!