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Make sure to install the security fixes for your operating system, software, and apps. Updates are usually related to fixing security issues that hackers might exploit.
Configure a firewall to control incoming and outgoing traffic. Allow only necessary ports and services to minimize the attack surface.
System logs should be routinely checked for questionable activity or illegal access attempts. Log analysis is a useful tool for identifying security threats and taking proper action.
Make sure to often back up your configurations and data. If there is data loss or security breach you can easily restore your data if you have the backup.
To lessen the attack surface, turn off any unused services and uninstall any software. Only services necessary for the operation of your server should be installed and enabled.