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Sam_Spade 3 points ago +3 / -0

I would suggest this video as a starting point. It deals with humanity and the Emperor of Man in 40k. https://www.youtube.com/watch?v=KyPjE1Sn-Ts&pp=ygUXbHVldGluMDkgZW1wZXJvciBvZiBtYW4%3D

It's the first in a series and the channel does a good job discussing lore and the various characters in the setting. After the suggested video just watch whatever catches your interest.