You can easily delete a WhatsApp contact; however, note that when you delete a contact in WhatsApp, the contact will also be deleted on your phone.

WhatsApp contact lists are made from your phone's contact list. Removing a contact from your phone should remove them from WhatsApp, but what can you do when the contact is not already on your phone?

You can delete a WhatsApp group that you created or that you are the admin of. Here's how to do it on iPhone or Android.