Default from the install above root has no password and is unsecure for the moment to just type `sudo mysql` then do each below and alter the usernames, password, and database names to your desire. So the example below the mysql datadase is `wpdb`, the mysql user is `wpdbuser`, and the password for that mysql user would be `changethispassword`
```sh
CREATE DATABASE wpdb DEFAULT CHARACTER SET utf8 COLLATE utf8_unicode_ci;
CREATE USER 'wpdbuser'@'%' IDENTIFIED WITH mysql_native_password BY 'changethispassword';