as the title say i wanted to create a custom inventory to let players upgrade custom items.
the functions would be : player put item in specific slot. then put materials in specific slots. player click upgrade button. then mats get consumed and item upgraded (statistics like durability, critical powe ecc...) so nbt data modification.
i kinda figured out how to create a custom inventory. but the rest is a bit unclear. any tips or links that could help me understand better what i need to do to create this?


