Elden Ring isn’t a series, it’s just the one game it’s not connected to From’s other games. You should engage with the lore but it’s not necessary, and there are no prerequisites

I’ve beaten Elden Ring 8 times, platinumed the game by run 3, and I still just can’t stop. Every run I try a new build and explore new places I’ve somehow never seen before. I’m so excited about the upcoming DLC I don’t even know how to contain it. Elden Ring is seriously the best game I’ve ever played in my life, it elicits a sense of discovery and wonder I’ve never gotten out of anything else.