It is helpful to ensure you are on the latest version of Totara 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 you are using by going to System information in the quick-access menu (or by going to yoursite.com/admin/index.php).
If you are visiting this page for the first time since your site was installed or upgraded you may be prompted to check and update any new settings before you can see this page.
This will show you the version and build numbers for the version of Totara you are currently running.
You can also see an overview of the differences between major versions in the version comparison help page.
Find out about the minimum requirements for your server on the Server system requirements 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 version of Totara, as well as older versions, by going to the release notes forum in the Totara Community.