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.

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

https://www.youtube.com/watch?v=Wl5t8yIWhPw&ab_channel=ShurropaRBLX

https://www.youtube.com/watch?v=B0qAGTaUG6Q

https://www.youtube.com/watch?v=Wd4sCXP0h4Y&ab_channel=polarisprog

etc...

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.