New to Derpibooru and Tag Changes

Brainless-Mind

I am new on Derpibooru and I am still learning my way around. I cannot seem to ask this question through my standard e-mail, nor can I seem to get in contact with an administrator, so I am trying here.
 
I looked in the FAQs, but I could not find what I was looking for. I tried looking in the Forums too, but they proved to be too complicated. As a result, I do not know if anyone has ever enquired about this before, but I would still like to ask to avoid complications.
 
I read that anyone can change tags on this site as long as they follow the rules and that they know what they are doing. I read the rules and I did know what I was doing, with a slight hiccup or two which were easily corrected. Also, as far as I know, the only thing that cannot be changed is the artist listed; for that, they must be notified. Still, there is something else that is confusing me.
 
Several days ago, I did not only add and change tags to many pieces of art that I have knowledge about, but I also created new tags and rendered several useless. I did not find anything on the site about creating tags or relocating art listed under them.
 
What I am asking is this: did I do something wrong?
 
You can see many of my tag changes here: https://derpibooru.org/profiles/Brainless-dash-Mind/tag_changes
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