I'm quite sure I didn't delete them myself, there were a few of them and they are all gone. Hence, I suspect moderator action. As I am new to the physics.SE community I would like to ask why these comments were removed, or more importantly why there was no note left. I tried searching help center and meta for some info or policies, but to no avail. I did find that "moderators reserve right to delete comments without notice" and I'm aware of general SE policy that "comments are ephemeral in nature", but removing several comments from a new member without any note just seems not right (I participate a bit in other SE communities being "trusted user" in two and I don't remember any such thing happening).
Could somebody let me know what happened? Is this a standard thing here? Is there any community norm help page so that I can read it and avoid at least a part of stepping on your toes?