How to add and remove a user in Linux ubuntu and Kali

How to add and remove a user in Linux ubuntu and Kali. This is a very simple process by using commands so you are going to enjoy this. 
These commands work in all Linux flavors 


 To add a new user you can use:
 sudo adduser new_username
 or:
 sudo useradd new_username

To remove/delete a user, first you can use:
 sudo userdel username
You can watch the video you get more visual experience