This post will keep getting updated as required. Message me if I have missed anything.
In my opinion the best “how to play” for new players currently is this one
Core Game
Space Marines
Armies of the Imperium
Armies of Chaos
Xenos Armies
Other Useful Bits
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Wahapedia (Very good all round source for everything 40k related)
I think you should include a link to https://wahapedia.ru/ they have not updated with 10th edition rules but it will come
That’s a good idea. I have had a lazy day today and not even updated the index cards. I will get around to it tomorrow