Academic
Structured learning paths and exam-focused Linux study tracks.
OpenSSH for admins keys hardening and tunneling
Learn how to deploy SSH keys, harden sshd safely, and use tunnels for real admin tasks across Debian, Ubuntu, Fedora,...
LVM for beginners PV VG and LV explained
Understand how LVM layers PV, VG, and LV work together, then practice safe create, extend, and shrink workflows with...
Linux security baseline updates firewall and least privilege
A practical baseline for tightening Linux hosts with default-deny firewall policy and least-privilege controls for...
Linux permissions chmod chown and umask deep guide
Learn how Linux permission bits, ownership, and umask work together in real operations. This guide shows safe...
Linux networking basics IP subnet routing and DNS
Learn how IP addressing, subnet masks, routing decisions, and DNS lookups work on Linux, plus a practical...
Linux filesystem layout (FHS) for beginners
Learn how Linux FHS directories map to real operations, with practical examples for troubleshooting, backups, and safe...
Linux ecosystem and Level 1 roadmap
A beginner-friendly map of Linux layers and a practical Level 1 path, with cross-distro commands and compatibility...
Linux boot process BIOS UEFI GRUB and systemd
Learn the Linux boot chain from firmware to systemd, with practical commands and troubleshooting steps for Debian 13.3,...
Kernel modules and hardware detection basics
Understand how Linux kernel modules map hardware IDs to drivers, how to troubleshoot missing devices, and what changes...
Firewall management with nftables and firewalld
Learn when to manage Linux firewall rules directly with nftables and when to use firewalld, with safe commands, distro...
find locate and which practical guide
Learn when to use which, find, and locate on real Linux systems, with safe command patterns, indexing caveats, and...
Disk health and capacity monitoring with df du and smartctl
Learn a practical workflow to track Linux disk capacity with df and du, verify hardware health with smartctl, and...