Thanks for an awesome answer!
I think I'm using fastCGI and not PHP-FPM though. Is that likely or am I completely not understanding how the system works? I followed the LEMP stack tutorial here on Digital Ocean so whatever that installs is what I'm using. Would you mind sharing what to edit if that's the case? Also, how would I check that? Sorry for such noobish questions, trying to learn a lot really fast.