Hi, I'm super new at the guitar and was wondering if anyone could tell me why my notes sound ringy sometimes.

I've tuned my guitar just like she said and I guess it feels kind of like the strings are a bit loose but I can't be sure because it's just me and the guitar and I don't know enough to know the difference

Maybe it's an old guitar or needs new strings? I bought her at a pawn shop, shes a beauty but maybe this is it? :)

Any help much appreciated, thank you