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 also see an overview of the differences between major version in the version comparison help page.
When installing a new version of Totara you may find it useful to review the release notes for the new version. Each of Totara's minor (monthly) and major (typically annual) releases are accompanied with release notes for each new version. Totara's release notes outline any new features and functionality, bug fixes, security improvements, and other issues that have been addressed. A new post is created for each release, with all new versions listed in the title. Each post contains a comprehensive list of all changes, separated based on the version number and type of improvement.
You can review the release notes for the latest versions of Totara, as well as older versions, by going to the release notes forum in the Totara Community.