I can't believe crafting and looting isn't apart of the core rules / core essence of RPGs. Here are a few resources

https://www.dmsguild.com/product/275550/Monster-Loot-Vol-1--Monster-Manual

https://www.dmsguild.com/product/234301/Crafting-Magic-Items-A-Guide-to-Artifice

https://www.gmbinder.com/share/-N9mk6faZ_nQyubwbt6d

https://www.gmbinder.com/share/-L9zV7_eIrs3bqQ_cNd5#p6

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