Spendable for coins

I would like to implement an inventory with some items that could be bought. Like a potion. I’m trying to do this however, I’m failing at this. So I would like an inventory system that would have like arrows and potions in exchange for coins. does any one have any suggestions for expanding on this or something I could watch?
currently doing this “https://www.youtube.com/watch?v=2WnAOV7nHW0&t=334s
but it’s not going well with what I have.

Thank you,
Trevor

The only thing I can recommend is a combination of the RPG: Inventory and RPG: Shops and Abilities courses.

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