Building a world for RPGs (Role Playing Games) has several steps to consider and two general approaches for implementing those steps. The general methods are top down and bottom up.
The Game Master's Handbook of Proactive Roleplaying by Jonah and Tristan Fishel
This is my summery of their guide that I can keep in my campaign binder. You should read the book to fully understand it. The book is a fairly quick read and the best resource I have on GMing
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