It is helpful to ensure you are on the latest version of Totara Learn, in order to get all of the best and most up-to-date features and fixes. As a site administrator, you can check which version of Totara Learn you are using by going to Site administration > Notifications in the Administration block.
This will show you the version and build numbers for the version of Totara Learn you are currently running.
You can see more information about the latest versions of Totara Learn by checking our the release notes in the Totara Community.
You can also see an overview of the differences between major version in the version comparision help page.