I outed myself as a Final Fantasy Freak at work during a meeting by casually mentioning I have the novelization of Final Fantasy XV and referring to Noctis without clarifying he was from the game.
I was asked what the best entry to play would be to start with the series, because they found the sheer number of entries intimidating.
My advice is the same as it ever was; the most recent one for the platform you like to play games on.