- [tag:certification] - this had some value some time ago... http://askubuntu.com/q/87445/169736 and now people uses it instead of [tag:certificates]
- [tag:tutorial] - in my eyes they seems as useful as [tag:learn]
- [tag:training] - odd questions, too vague, too broad, too bad... this tag seems related to more odd tags
- [tag:documentation] - misused, the tag is there for questions asking about the documentation as whole (writing, managing, distributing, creating documentation), but people seems to use it to ask *for some kind of documentation* which is suboptimal (there should be a question about where is all the documentation Ubuntu provides... [I remember answering one of that kind][1], which also has the documentation tag)
- [tag:web] - D: This one seems about anything. Let me repeat, this tag seems about **ANYTHING**. From PHP to web servers to "[this web page doesn't run in Ubuntu?][2]". Is way too broad while it can be break down in smaller, more concise tags.

So, the mission is:

 1. If the tag is about a topic, and the topic is on topic. Then create an excerpt/wiki and make sure all the questions 
 2. If the tag is about a topic and the topic is off-topic, too broad or otherwise lead to bad questions, remove it. I remember that some user used the presence of a tag to infer that his question is on-topic.
 3. Tag is too vague, remove it.
 4. Another tag describes better the question, retag it.
 5. Not sure how to tag a question, [ask in chat](http://chat.stackexchange.com/rooms/201/ask-ubuntu-general-room).
 6. If you are a >2000 reputation user and see any bad tagged question that needs also improvements, just edit it. Reviewers will evaluate if you edit was useful, but be careful about spamming reviews ;).




  [1]: http://askubuntu.com/q/332301/169736
  [2]: http://askubuntu.com/q/348369/169736