@ankitaanchan I haven't read the full article, but from initial two lines it seems like it is a way of controlling data access to the user based on their login. In PBI with RLS you define DAX query to filter your data and assign that to groups. Those groups will contain your ursers email addreses to whom you've shared dashboard. Users login with their email address in PowerBI. So essentially you have limited users based on their login (which is email) in power bi.
If you are afer something else or any specific way can you please provide some more information ?