I’ve just added the accepted answer plugin. Which is an official Discourse plugin that allows staff and the user which creates a given topic to mark a reply as the ‘solution’.
This makes it super easy for new users to find existing solutions especially when discussions are long & complicated to follow. Not all topics are appropriate for a accepted answer as they may be discussions with no clear solution so there is no need for every topic to have an accepted answer.
P.S If there are any plugins that you think should be added in the future be sure to open a topic in the site feedback category or message me personally.