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Caleb
There is a notable lack of tags available here. None at all actually. Never mind TeX relevant ones, just none for anybody.

How do we go about adding relevant tags?
Top Answer
Caleb
We don't need all of the SE ones (yet), but given the nature of engine specific expertise and packages, filtering on those things is going to be a very common desire. If nothing else as an end user it is _very_ useful to be able to limit searches to a tag of the package or type of thing I'm looking for when hunting for previous questions, and all of these will fit into that usage pattern.

Here is a list to get us started. Feel free to edit this to add...

## TeX Engines

* pdftex
* luatex
* xetex
* context
* latex3

## Bundles of stuff that are their own ecosystem

* koma
* texlive
* ctan

## Common packages

* tikz
* fancyhdr
* graphicx
* biblatex

## Areas of expertise

* math
* fonts
* figures
* classes
* tables
* beamer

## Build tools

* arara
* latexmk
* pandoc
Answer #2
Jack Douglas
Right now the way to add tags is to give me a list[^1].

We will of course at some point cater for user-added tags, but in the meantime as a community TeX needs to decide how it will be using tags:

1. Just a few, carefully chosen, tags that cover the areas people will want to filter questions by
1. As many as tex.se (about 2000)
1. Something in between

My advice is to focus on the *reason* for tagging. Things like "I want to filter questions by X" and "We don't want every question title to contain Y or Z" seem to me to be good reasons. On the other hand "Tags help Google" seems to be to be very tenuous, and a lot of effort for the community to maintain.

You can of course change your mind later on whatever you decide now.

[^1]: TopAnswers has the concept of 'implied' tags. Each tag can 'imply' a maximum of one other tag.
How do we create new tags?
Jack Douglas
@Caleb we'll reassess as we go along — there are obviously other options that we could implement in the future. For now I've added your tag list and subscribed to the question so I'll see answer updates here and add more on request.
Caleb
For another tags without anything attached to them yet has some problems too.
Caleb
For one importing posts and loosing tag data is not an insignificant loss.
Caleb
@Jack I'm not sure this is the right approach. Just collecting some tags I _know know_ we'll want to seed things is suggesting that piece-mealing this is going to be a pain.