@rewiw24085 Should I repeat the post directly above yours?
I checked your settings, notifications for new posts to your watched topics said "Notification & e-mail" so I changed it and told it to save the change. We'll see if that works. (If you got an email about this post, then it didn't.)
@millerjohn You only have about half an hour in which to delete comments. They got tired of people removing comments after they'd already been replied to because it made conversations hard to follow.
It's not so hard to understand. Categories are like folders. Folders can contain both files and subfolders; likewise categories contain both threads (like this one) and subcategories.