In this blog, I am going to show you how to get the SharePoint version with out doing any programming, Central Administration or admin activities.
This is a simple solution as far as I know,
When you access the url, after the authentication we will get the below message,
vti_extendedversion gives the version of the current SharePoint environemnt. Here 16.0.0.1211 is the sharepoint Online version.
Installed version of my local SharePoint site environment is
https://sharepointsite/_vti_pvt/service.cnf