To join WhatsApp groups you need follow these steps:
First, find out your interest base WhatsApp group which you want to join, You can check the above WhatsApp group links.
Before selecting any group, you must have installed Whatsapp App on your Android or IOS mobile.
Now you can find and select any WhatsApp group, you wish to join & click on it.
It will redirect you to WhatsApp's official page, Where you click the button "Join Now".
All done, Now you are the member of Whatsapp group!, You can update & descriptions about the Whatsapp group!