How to achieve making an inventory system like adopt me?

How would i be able to achieve making an inventory system like adopt me? Where it datastores, has preset items in it, if you buy things it gets added to it, you equip it it gets added to your hotbar, stuff like that. I’m making a roleplay game and i can’t figure out how to make one like theirs, most tutorials online are far different from what i’m looking for.

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