What is the default superuser password for a macbook pro

I created a user account and I am the 'admin'.  When I type 'su' in a terminal window, my password is not accepted.  I also set up a 'master password' and
this is also not accepted as the superuser password.  What can I use for the superuser password or how do I change it?

By default, it's set to an illegal value. Unless the root user has been enabled, nothing will be accepted.
(87130)

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