I have an inventory, how exactly to implement it so that when you pick up the item and reload the scene, it will already be picked up

Because of this, I’m starting to rework this idea a *second *time!

If there are any mistakes, please forgive me, I am writing through a translator.

How to make sure that when the scene is reloaded, the selected items are saved in the inventory

I don’t understand PlayerPrefs, ScriptableObject and Binary files even though I wanted to understand them
can someone explain to me in detail