It may not be your intention, but if I’m being honest, your question, and the rest of your post come off very condescending and unwelcoming to “newbie’s” wanting information. You may reconsider how you respond to questions here, or maybe remember back when there were new aspects of the hobby that you had to learn. I am FAR from a new collector. I’ve been collecting for 35+ years, and only recently started hearing about the errors in the newer quarters, and have always been fascinated with mint errors, which is why I said I was “casually” roll searching and looking to learn about them. My confusion between picking out DD vs. MD. Is simply because as some pointed out, in modern coins, DD is rare and I wanted to clarify what I was seeing was MD, which is what I thought I had. Your tendencies to use the term “our” hobby seems very unwelcoming in this context and I think perhaps it may just be your wording but this is the kind of response that keeps younger or newer collectors from coming here and asking questions to gain the knowledge you think you hold over them.