"Questions" is an addon for Confluence which adds question and answer functionality to the wiki, as well as knowledge bases and some "gamification" stuff.
You've actually asked your question in a Confluence that has Questions installed, so you're using it now.
Have a quick look through the basics at https://www.atlassian.com/software/confluence and https://www.atlassian.com/software/confluence-questions and then ask us more!
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