Since this is a self-managed server, you are responsible for its security. We highly recommend: 1) Disabling direct Root login via SSH and using a standard user with sudo privileges instead. 2) Using SSH Keys for authentication rather than passwords to prevent brute-force attacks. 3) Configuring a firewall (like UFW or iptables) to close all ports except those you are actively using. 4) Running regular updates (e.g., apt update or yum update) to patch security vulnerabilities.