How would i go about making an Inventory saving script for a UI?

Hello, I am designing a UI for a game i am making and am in need of a system which when an item has been purchased from my shop will be dispensed into the inventory UI as an image button.

I'd then like the Image buttons to be saved so that when a user comes back onto the game they will be able to equip/unequip trails/nametags/effects/pets. I know how to get the individual buttons to equip and unequip items but have no idea on the saving aspect of this.

I am still a beginner when it comes to data saving and would appreciate any help i can get. Thankyou.