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.
I doubt anybody will make entire system for you here.
I think you should learn more basics before going to that part.
There are many tutorials about that subject on Youtube, so I think you would have easier time going there and learning it step by step
there are many of them on internet and I think you can find one suited for your game
Also by learning it step by step you will have easier time customizing it.