This tutorial takes you through how SF's save system works, adding your own values to save/load, and saving interactable object states.
Timestamps,
0:00 - Intro to Save System
1:24 - Setting up Custom Values
1:58 - Example Interactable
5:05 - Saving/Loading Custom Values
8:28 - Saving Interactable Object States
13:42 - Outro