How to Create a root user in linux

How to Create a root user in linux-Linux general technology-Linux technology and application information, the following is a detailed description. In linux, how does one create a root user? Can I use this new user to delete the root user?

Create a common user
Modify/etc/passwd user
Change the user id to 0.
You can delete the root user.

You must create a Super User.

SHELL determines whether a user is a superuser based on the user's UID. If the user's UID is 0, it is a superuser.

In Linux, the most important thing is the id value, not the login name. For example, to create an admin user using the njbfy (bfy) method, admin is the Super administrator, which is actually the same as root. You can use su admin in shell to check whether it displays root. Because it is determined by uid. This is of no use to others, but creating a Super User can avoid forgetting the root password.

The user in group 100 has the root permission.