Content Version Numbers are used to differentiate Policies/Courses/Phish with identical names, and are generated via several actions on the platform.
1. Publishing Content
Publishing an initial piece of content will result in a Version 1.0 number being generated:
2. Saving Content
If content has initially been saved, it will generate a 0.1 Version number.
If content has been saved initially, and then published, it will then generate a 1.1 Version number.
3. Creating New Content (from a live or archived piece of content)
If content has been created as a new version, it will generate a new Version number. For example, if the previous Version number is 1.0, then the number for the new Version will be 2.0
For further information please see article: Where Can I View Content Version Numbers?