You may not know but even in a fresh install of Moodle there are loads of administrative reports available to you to better understand your site and what’s happening on it. From all comments, to backup status, to logs and stats there are a bunch of options for insight. Check out this video by HRDNZ (provider of Moodlebites and Freemoodle.org) which provides an overview of what’s available.
Direct video link: https://www.youtube.com/watch?v=YJ5qxYfWmbY
More information is available at https://docs.moodle.org/27/en/Site-wide_reports