This is going to sound beyond stupid but I’m a little confused on what ruminating is. Like I have heard it a lot on this app, but I have also heard it otherwise and I just don’t really know what it means. I know this is stupid but if someone could let me know, that would be great!

Thats not a stupid question at all. Ruminating is kind of hard to explain. But ill try my best. Ruminating is what you replay something you did or said over and over again in your mind. You overthink it and overanalyze it to death. You critique every little things. Ruminating can also be if you have an intrusive though. Say for example you have a thought that your significant other cheating on you and then you think "What if she/isn't happy? What if he or she doesn't love me anymore? What if he or she breaks up with me? What if I never get married and end up all alone? What if he or she is cheating with a friend or family member? What if I cheated and just don't remember it?" Anytime your brains spirals into what ifs or causes you to think about the worst case scenario thats ruminating.

There have been a lot of terms I've seen used frequently here and I'm also looking forward to getting some clear answers about what everything means!

Read Dr. Michael J Greenberg’s material on the subject: https://drmichaeljgreenberg.com/defining-rumination/