Tim Cain is making videos which are specifically about game design but have a lot of great insights into world building
Tim Cain was the lead on the original Fallout, but also many other well regarded RPGs. He has a channel and I picked a video at random but really suggest watching them all. He has a lot of insights into designing compelling worlds that I think translates well into worldbuilding, especially worldbuilding for the purpose of running a TTRPG.
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