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The track for the people who make "sudo something" feel boring. RHEL and Ubuntu daily ops, Bash that won’t bite next quarter, LVM and filesystem rescue, and finding the slow part of a system without guessing.
Each lesson is a 1-line briefing on what you'll practice. Read the briefing, then click Practice in terminal to drop into a real sandbox.
Disk-full puzzles, systemd journals, cron timing, iptables lockout recovery. The fastest way to look senior is to stop guessing about /proc.
OOM, LVM resize, slow disk diagnosis, SELinux denials, time drift. The bugs that take production down without leaving a clean error message.
Boot rescue, kernel sysctl for high-throughput NICs, memory-image forensics. The lights go out and you bring them back.
The graded assessment uses the same terminal sandbox as these lessons : only it scores you on accuracy, methodology, tool fluency, communication, and real-world fit.