If you're a Moodle admin, this page will tell you about the major changes affecting you in Moodle 3.8. If you'd like to see full details of the release with technical information, here are the Moodle 3.8 release notes.
New theme: Classic
Clean, More and the hidden Bootstrapbase are removed and replaced with the customisable Classic theme.
Significant improvements to Learning Analytics increase usability and efficiency.
Hide course lists
New capabilities include moodle/category:viewcourselist which allows you to define who can see lists of courses in various categories.
Messaging settings are in a new site administration category.
Improved support for Open Badges v 2.0
You can now connect to other Open Badges v 2.0 platforms and exchange badges with the Badgr.io platform.
LTI 1.3 and Advantage
Moodle is one of the first platforms to implement this IMS Global standard.
Perform large backups in the background while doing other tasks.
A new setting allows you to easily test outgoing mail configuration.