This is one of the ongoing problems; there is no documentation for users on how to tag. People in the committee in charge of that have said that there was a call to create a general guideline for users on the tagging system and that was quashed on the grounds of not wanting to exert control over anyone's creativity.

Meanwhile, tag wrangling is a huge tangle of work, weeding out duplicate tags and using a system called "synning" (or maybe "syncing") to make sure that the Kirk/Spock tag, the Spock/Kirk tag, the James T. Kirk/S'chn T'gai Spock tag, James Kirk/Spock tag and everything similar are synonymous and will all pull up all of the Kirk/Spock in the archive when someone looks for them.

Because that's somehow better than providing even general guidance like "tag pairings in alpha order by character last name" or something.