I believe any tags that have ever been used can be found using the method of going through a post > clicking a tag, allowing users to create their own tags. I've seen some posts from the Dev team announcing "official tags".
I'm guessing the list of options on registration is either official tags or the list of Popular tags from the left hand navigation (on desktop). I'm not sure how the popular tags list is curated, although Dev is open source - so you can poke around to find out if you want.
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I believe any tags that have ever been used can be found using the method of going through a post > clicking a tag, allowing users to create their own tags. I've seen some posts from the Dev team announcing "official tags".
I'm guessing the list of options on registration is either official tags or the list of Popular tags from the left hand navigation (on desktop). I'm not sure how the popular tags list is curated, although Dev is open source - so you can poke around to find out if you want.