For those who don't know about this feature, tags are a great way to find similar content or a specific topic. They'll only work, however, if everyone gets in the habit of doing it. For threads with tags, related content will show at the bottom of the thread page. Good tags are those that other people are likely to also use and are either broad categories (e.g. "front lever") or specific but commonly understood (e.g. "MN/PE1").