Is this where I ask my question about handguns?

Or do I have to find a heading for Handguns?

What are trackbacks for

What are tags for?

Sorry, I don't understand any of this jargon (tags, subscriptions,etc.)

This is, I believe, the wrong place for your handgun question.

I believe that it's the correct place for your "trackbacks" and "tags" questions. However, I haven't a clue what these things are.
I suggest that you pay no attention to those terms, and just post your gun questions in the New To Handguns Area, or in an area dealing with the specific gun in your question.