Tutorials · Linux
Linux tutorials
From the basics to partitions, permissions and web servers. Follow them in order or jump to what you need.
● 30 free guidesLinux lessons30 guides
What Is Linux? History, Distributions and File System
What is the Linux operating system? Its history from Unix and GNU, how the kernel and distributions work,…
3 min read 0210 Reasons to Use Linux in 2026
Ten practical reasons to use Linux in 2026: cost, security, stability, control, cloud, developer tools, older hardware and…
3 min read 035 Linux Predictions for 2022: What Actually Happened
We look back at five popular Linux predictions for 2022, from Linux gaming to Wayland and Flatpak, and…
3 min read 04Difference Between Linux and Unix: History, Licensing and Use Today
The difference between Linux and Unix: history, licensing, kernels, POSIX and certification, examples like AIX and macOS, and…
3 min read 05Difference Between Linux and Windows: A Practical Comparison
The difference between Linux and Windows explained: licensing, kernel, file system, users and permissions, software, security, servers and…
4 min read 06Linux Fundamentals and Basic Commands for Beginners
Linux fundamentals and basic commands for beginners: the shell, paths, files and directories, searching text, permissions, processes and…
3 min read 07Linux File and Directory Permissions Explained (chmod, chown, umask)
Linux file permissions explained: read, write and execute for owner, group and others, directory permissions, chmod modes, chown…
3 min read 08Linux Special Permissions (SUID, SGID, Sticky Bit) and ACLs Explained
Linux special permissions explained: SUID, SGID and the sticky bit with examples, their security risks, and how to…
4 min read 09Linux User and Group Management: Commands and Best Practices
Linux user and group management explained: user types, key files, creating, changing, locking and deleting users, groups, sudo…
3 min read 10What Is a Disk Partition? Types and How to Create One on Linux
What a disk partition in Linux is, MBR vs GPT, primary, extended and logical partitions, and how to…
3 min read 11What Is Swap on Linux and How to Create a Swap Partition or Swap File
What swap is on Linux, how much you need, how to create a swap partition or swap file…
3 min read 12What Is LVM and How to Create an LVM Partition on Linux
What LVM is, its building blocks (PV, VG, LV), how to create an LVM partition step by step,…
3 min read 13How to Set Up an SSL Certificate for Nginx: Let’s Encrypt and OpenSSL
How to set up an SSL certificate for Nginx: free Let's Encrypt certificates with Certbot, self-signed certificates with…
3 min read 14How to Install Nginx on CentOS Stream, Rocky Linux and AlmaLinux
How to install Nginx on CentOS Stream, Rocky Linux and AlmaLinux: install the package, open the firewall, manage…
3 min read 15How to Install Nginx from Source on Rocky Linux, AlmaLinux and CentOS Stream
How to install Nginx from source on RHEL-family Linux: build tools, download and verify the source, configure modules,…
3 min read 16PHP2Shell (CVE-2026-109618 & CVE-2026-109619): What Happened, Who Is Affected and What to Do
PHP2Shell is a pair of critical (CVSS 9.2) PHP flaws that allow unauthenticated remote code execution. Here is…
8 min read 17How to Check and Patch PHP2Shell on Linux Servers (Ubuntu, Debian, RHEL, Docker)
A step-by-step guide to finding every PHP install on your Linux server, patching PHP2Shell (CVE-2026-109618/109619), verifying the fix…
7 min read 18Kali Linux vs Parrot OS (2026): Which Should You Use?
Kali Linux 2026.2 vs Parrot OS 7.4 compared: base, release model, tools, desktop, privacy, editions and a clear…
9 min read 19How to Troubleshoot High CPU Usage on Linux: A Step-by-Step Guide
A tested, step-by-step process to find and fix high CPU usage on Linux: load average, top, mpstat, pidstat,…
7 min read 20How to Secure a Linux Server on AWS EC2: 10 Essential Controls (2026)
A practical, tested checklist for securing Linux on AWS EC2: Session Manager instead of open SSH, IAM roles,…
8 min read 21How to Self-Host n8n on Linux with Docker Compose, PostgreSQL and HTTPS (2026)
Set up a production-ready self-hosted n8n on Linux: Docker Compose, PostgreSQL 18, automatic HTTPS with Caddy, a first…
8 min read 22How to Build a SOC Home Lab on Linux with Wazuh SIEM (2026 Guide)
Build a free SOC home lab with Wazuh 4.14: lab design, all-in-one install, connecting Linux and Windows agents,…
7 min read 23NGINX October 2026 Vulnerabilities: Check Your Config and Patch
Five NGINX vulnerabilities were fixed in 1.30.6 and 1.31.7. Learn which configs are at risk, how to audit…
5 min read 24Tailscale SSH Vulnerability: Root Risk, Fixes and What to Do
Tailscale SSH vulnerability guide: July root bugs fixed in 1.98.9/1.98.10, new Tailworm flaws unpatched. Update, audit SSH rules,…
10 min read 25Hijacked Tor Relays Stole SSH Passwords: Lessons for Every Admin
Hijacked Tor relays intercepted SSH logins in October 2026. Learn who was at risk, how to check known_hosts…
5 min read 26Automate Linux Server Tasks with Python and Cron: Step-by-Step
Python cron automation for Linux servers: tested disk-alert, log-cleanup and tarfile backup scripts, IST crontab examples, locking, logging…
12 min read 2710 Essential Linux Automation Scripts for Sysadmins
Ten tested Linux automation scripts for sysadmins: update reports, user audits, SSH failures, port and file drift, backups,…
15 min read 28Building Self-Healing Linux Servers: Scripts, systemd and Smart Alerts
Build a self-healing Linux server with systemd Restart and WatchdogSec, a tested bash remediation script with cooldown, timers…
12 min read 29Securely Run Local LLMs on Linux: A Step-by-Step Guide
Learn how to run local LLMs on Linux with Ollama and llama.cpp, then lock them down: loopback binding,…
10 min read 30Detect SSH Brute Force Attacks with Logs and fail2ban
Learn to detect SSH brute force attacks on Ubuntu 24.04 with journalctl, grep and fail2ban, and spot the…
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