What key tasks have you performed related to system management and configuration in Linux?

In my experience with managing and configuring Linux systems, I have performed the following key tasks:

• Installing and updating packages via package managers (apt, yum, dnf).
• Configuring network interfaces and firewalls (iptables, firewalld).
• Managing users and groups, setting access permissions.
• Monitoring system resources using tools (top, htop, vmstat).
• Configuring services and daemons through systemd (creating and modifying unit files).
• Automating tasks with cron and systemd timers.
• Setting up logging and log analysis (journalctl, /var/log).
• Backing up and restoring data.
• Configuring SSH for secure remote access.

These tasks help maintain stable and secure operation of servers and services based on Linux.