As far as I know (I've never seen the film completely) "Ring" is about a video-tape that kills you seven days after you have seen it. In the movie you first see a ring and then you recognize that it's a well. A girl has been drowned by smb. in this well and now kills people as a revenge or w.e..
I hope it's now a lil bit more clearly, or not more complicately at least.