When you ask a new question (or edit one whithout having the edit privilege) and edit the tag field, a help box with the following appears on the right:
How to Tag
A tag is a keyword or label that categorizes your question with other, similar questions.
- favor existing popular tags; avoid creating new tags
- use common abbreviations
- don't include synonyms
- combine multiple words into single-words with dashes
- maximum of 5 tags, 25 chars per tag
- tag characters: [a-z 0-9 + # - .]
- delimit tags by space, semicolon, or comma
Most of this advice does not apply to users without the create-tags privilege and thus is unhelpful, may confuse them or even disappoint them when they put effort in creating a tag when adhering to the advice and then realise that they are not allowed to create tags anyway. Moreover, some advice is hardly relevant due to the live search for existing tags.
I thus propose to change this help text for those who cannot create tags or, if that’s too troublesome to implement, change the help text for everyone, because it’s new users who really need this text (while those who have acquired the power to create tags usually know how to obtain information on this anyway). The focus should arguably shift from technical details to proper tagging.
As a sidenote: It would be nice if basic, site-specific tagging advice would be included here, which is apparently possible. For example users on Stack Overflow could be informed to use the programming language their question is about as a tag or users on SciFi & Fantasy to use the work their question is about.