Core commands, filesystem internals, permissions and hardening.
Linux Fundamentals
Shell basics, filesystem hierarchy, processes and services.
Permissions & Ownership
chmod, chown, umask, SUID/SGID, sticky bit, ACLs.
Bash Scripting
Loops, conditionals, functions and automation patterns.
System Hardening
SSH hardening, auditd, firewalls, service minimisation.
Log Analysis
journalctl, auth logs, grep/awk triage workflows.