The Geek Stuff explains the 7 default options in sshd_config file that you should change.
In sshd_config, the lines that start with # are comments. For those options that uses the default values, the sshd_config file contains a commented line with the option and its default value.7 Default OpenSSH Security Options You Should Change in /etc/ssh/sshd_config
This makes it easier for us, as we can see the OpenSSH option name and the default value without having to lookup somewhere else.
For example, sshd_config file contains the following commented line. This indicates that the PubkeyAuthentication option contains “yes” as the default value.
