Final Fantasy VII made such an impression when it was released in 1997 that it changed the way games are played. Its legacy led us to Final Fantasy VII Remake in 2020 and Final Fantasy VII Rebirth, which you've been playing non-stop for a month now. But if you are under, say, 40, or are relatively new to gaming, you might be curious about the original Final Fantasy VII. It's still readily available, in quite a few versions, but the trick is putting yourself in the place of a 1997 gamer. There will be a lot of features you are used to that aren't there, and a lot of tips and hacks that took that generation years to figure out.
You can skip a lot of confusion with a handy guide to the original Final Fantasy VII from Den of Geek. First, you need to sort through which version you want to start with, depending on what console you have and where you can get a copy of the game. Each version has its quirks, and you'll want to know the stories behind them. And customary game play was a bit different in 1997, so you'll need some warnings. But once you get into the groove, playing the original will give you a deeper understanding of the Final Fantasy universe and an appreciation for the newer games that Final Fantasy VII spawned.
Then it will dawn on you that there was a Final Fantasy I, II, III, and so on that you might want to explore, too. That should keep you busy for the next year or so.