How to make simulator backpack system?

I m new to scripting and i want to know how to make a simulator backpack system and make a part collectable when hold e, after i hold e the backpack gui go from 0/10 to 1/10.

This video I made a year or so ago should be of use (don’t mind the thumbnail, I gotta remake it)

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I saw it earlier and still don t know how to make a part collectable and when i hold e the backpack gui to go plus 1

You just have to add 1 to the stat, it should automatically change

I mean i don t know how to make it collectable and when i hold e the gui to change like i know how to change the stat but idk how to make it collectable when hold e and dissapear and the gui change

So can you tell me how to do it please?