If you want to know more about the genesis and the lore of Tibia I suggest starting with https://www.tibia.com/library/?subtopic=genesis.
But I'd also recommend to read books in-game. Check out the different libraries and you will find lots of books - some who will have hints to some classic quests. What books to read is a very broad question though, I suggest looking here: https://tibia.fandom.com/wiki/Library
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