Question about the Save Game BP

I’m pulling my hair out (sort of, well not really), I can’t figure this thing out. Do I need to create BP Interfaces for the variables I want to save? Every screenshot I’ve seen has variables with mystery nodes that I can’t seem to find. (Like the ‘Target’ pin which attaches to the ‘Save Game Object’) Are these Interfaces? How do I reference which player’s Health I’m saving? It’s confusing.