(stuck :() How can I save the player position/data when flicking between scenes

Hi,

New to scripting and the such. I have spent a while looking at PlayerPrefs and how to use them. I have a main level and the player can flick to a "inventory scene" freely during the game so they can check notes and the such. I can't seem to get my silly head round saving the player progress in the main level,loading the inventory scene than loading back the main level with everything the same as when the player entered the inventory.

Javescript would be preferable for any responses.

Thank you so much guys for your help in advance!!! :)