How do you create an Admin User or User with additional authorization?

I just started learning the Authorization part of laravel and I keep wondering how can I make an Admin User at least I want to know the first few steps how to do it.

So I saw this part of the documentation:

Gate::define('edit-settings', function (User $user) {
    return $user->isAdmin
                ? Response::allow()
                : Response::deny('You must be an administrator.');
});

My understanding of this is, there is a function in the user model that has name of "isAdmin" and the gate checks if it is true or false.

What I wanted to know is how does the "isAdmin" function work? Is there a table column in the users table that defines if a user is an admin or not? So the "isAdmin" function just checks what is indicated on that column? Is that how it basically work? Or is there a bettery way to do it?