The last one in the list is the one which contains the selected item. The next two items in the 'Get Info' window tell you the date and time that the selected item was 'Created' and 'Modified' . These are useful when you are trying to find out which of a few items have the latest changes or when one was originally created. The next item is the one that I am, more often than not, looking for when I open 'Get Info'. This is the 'Version' .
Version is shown for applications, control panels, and extensions.
Version information is useful for finding out if you have the latest revision of any particular item. Many times an outdated version of a particular software will be the cause of your Mac not functioning the way it should. Any call for tech support on a particular application will inevitably lead to checking the version that you have. The 'Version' information also usually contains the name or the company that created the particular software. This can be helpful in tracking down what company created a particular application, control panel, or extension.