Linux

Beginner → Advanced

From first commands to kernel-depth troubleshooting.

Outcome

Operate, troubleshoot and reason about Linux like an on-call engineer — not just memorise commands.

The ladder

Beginner

▸Filesystem layout
▸Users & permissions
▸Processes
▸Services
▸Logs
▸Packages

Intermediate

▸systemd
▸Networking tools
▸Disk troubleshooting
▸Performance basics
▸SSH
▸cron / timers

Advanced

▸Boot process
▸Namespaces & cgroups
▸strace / lsof / tcpdump
▸Kernel & sysctl basics
▸Production incident response

Example lessons

lesson

What chmod 755 actually means

lesson

systemd units, properly

lesson

Why a full disk takes everything down

Practise with puzzles

IntermediateDisk Full, But du Says It's Fine

BeginnerThe Service Won't Start

AdvancedHigh Load, Low CPU

Related labs

LabLinux Black Box: The Silent Web Server

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