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Just FYI there is a group, or tag, called introduceyourself that all people already use to introduce themselves as newcomers. I would take a look at the established tags that are already created and followed, and use them. On your home page, the tags are on the left of the page

Oh, ok. Thank you! Can I create a new tag even after I have posted my post? (That sounds silly, hehehe... posted my post).

You can edit your post after the fact. I've done it a few times actually

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