Hello I'm new to the FF series, having only finished the FF game for the first Game Boy and bought (but not fully played) FF 7 from Steam.

Final Fantasy X was the last game my cousin played before he died. Would like to play but I've this question just to be on the safe side:

It's safe to just only play FF 7 and X right? The stories from what I've heard aren't interconnected but I'm wondering if there are references to previous games in each one?