Operate enterprise Linux environments with security in mind: user identity, standard & special permissions (SUID/SGID/Sticky bit), cron, services, and audit trails.
What you'll practise: Create users and groups with least-privilege access; Find and fix dangerous file permissions on a practice server; Create and troubleshoot a systemd service; Schedule a job with cron and confirm it ran in journalctl; Trace a process and review its activity in the logs.