This question was asked earlier and addressed something that while trivial, is a significant rules query. The term advantage, while having a specific meaning in 5e, is used as a noun without an article which is uncommon in typical English grammar.
The question was generated by genuine confusion (likely a failure to read the complete rules, but whatever). Seeing this as a likely frequent scenario, and a question that could come up on countless occasions, I did something about it. I edited the question into a canonical "what is advantage" question.
Apparently missing the point, a moderator closed the question. There is a good answer on this question already, it's going to be a question that a lot of people have. Yeah, it's low hanging fruit, but it's a question we can dupe other questions into.
What's the point of closing this question? It's a valid question, and it benefits the site.
The larger issue though is that this is a first question from a new user. We accommodate tons of these for other systems. By closing a valid first question from a new user we're driving them away, not helping them feel at home here.
Note: My first instinct was to close this, it's a simple rules question, surely there was something we could dupe it to...but no, we don't have a question that asks "what is advantage?" so I edited this to be it.