A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.
For questions on answers marked as best (accepted) by the original poster of question
Questions about answers: how to answer, whether specific answers are appropriate, etc.
For issues related to comments that should have been submitted as answers.
For questions about the proper procedures, tips, and other info about asking questions on the main site
Questions about the signs or tokens that are awarded to encourage and incentivise positive community actions on LL SE.
Questions asking for nominations for the best answers and/or questions submitted during a specified period.
Questions related to the site's birthday.
Questions about the concept of a community-run Language Learning blog
Question related to the favorite question feature. (Questions can be marked as favorites using the star button.)
Questions about the type of reward—in the form of reputation—that can be offered to get additional attention for a question, especially to reward great answers.
Used for meta requests to "burninate", or delete, a tag or multiple tags.
Questions about the real-time, stateful web chat that is a part of every Stack Exchange site.
For questions about the rules or miscellaneous information on the chatroom for Language Learning SE
For questions that deal with questions that are or were closed
For questions about the reasons used to close questions
Questions related to comments, i.e. the small addenda to a question or an answer.
For questions about rallying the Language Learning community of users together as well as site-building activities
For questions on posts marked as community-wiki, which transfers ownership of the post to the community
Questions about the quarterly creative commons data dumps of all public data in the Stack Exchange network Q&A sites, especially about the subset of this data dump with LL SE data.
Questions about about the functionality, etc. of The Stack Exchange Data Explorer (SEDE: http://data.stackexchange.com/) that are relevant to Language Learning SE. Questions about the Data Explorer in…
Questions related to questions that were deleted from Language Learning Stack Exchange.
Questions regarding the design of the Language Learning SE, e.g. for issues with the layout. Questions about the design of Stack Exchange in general should be asked on http://meta.stackexchange.com/.
The question you're asking is designed to solicit opinions or best practices on a particular topic, with the goal of reaching community consensus.
Questions about the process of editing, how edits work, and other general inquiries about the edit system.
Questions related to the norms and standards of accepted behaviour and politeness on Language Learning Stack Exchange.
Questions about identifying and closing questions that are duplicates of another question.
Questions related to the flagging process, which is used to deal with spam and rude or offensive content.