Minecraft doesn't have concrete lore, but its hints and clues can be used as a scaffold by modders and builders alike. This video contains all such lore that I am aware of, as well as some examples of how to expand it.

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0:00 Introduction
1:27 Water and the Ocean
1:50 Example 1: Crafting Recipe
2:45 The End
5:01 Example 2: New End mobs
5:46 Energy
6:44 The Nether
8:47 Gold and Piglins
10:00 Asking Questions
10:47 The Undead
12:02 Example 3: Totem of Withering
12:45 Illagers and Villagers
14:04 Miscellaneous quasilore
14:59 Example 4: Badlands Pyramid
15:38 Conclusion