The Linux Kernel

🧭 Linux & Nginx — Master Notes Index (Beginner → Advanced)

Level	Category	Topic / Description	Link
🟢 Beginner	Linux Basics	🔹 Linux File Permissions – Explanation of rwx, chmod, chown, umask, symbolic and numeric modes with examples and diagrams.	View Notes
🟢 Beginner	Shell Scripting	🔹 Bash Scripting Basics – Variables, loops, conditionals, functions, I/O redirection, and automation fundamentals.	View Notes
🟢 Beginner	Linux Commands Collection	🔹 Kali Linux All Commands – Essential Kali commands for penetration testing, system checks, and network tools.	View Notes
		🔹 Ubuntu Commands Reference	View
		🔹 Fedora Commands Reference	View
🟡 Intermediate	Web Server Setup	🔹 Nginx Setup & Configuration – Step-by-step guide for installing and configuring Nginx, directory structure, and virtual hosts.	View Notes
🟠 Advanced	Network Troubleshooting	🔹 Nginx Troubleshooting Guide – Diagnosing connection issues, DNS, reverse proxy problems, and HTTP response code analysis.	View Notes
🟠 Advanced	Network Forensics	🔹 Network Forensics & Packet Analysis – Using tools like Wireshark, tcpdump, and analyzing ICMP, HTTP, and TCP behavior.	View Notes
🔴 Expert	Nmap & Security Analysis	🔹 IP Not Found in Nmap – Steps to troubleshoot unreachable IPs, ICMP filters, firewall rules, routing, and port scans.	View Notes
🔴 Expert	Firewall & Security Configuration	🔹 Allow Firewall Rules for Nginx – Configure UFW, firewalld, iptables to allow ports and IP-specific access in Linux or cloud.	View Notes

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🧩 Progress Flow (Mermaid Diagram)

graph TD
A[Linux Basics] --> B[Bash Scripting]
B --> C[Ubuntu & Fedora Commands]
C --> D[Nginx Setup]
D --> E[Nginx Troubleshooting]
E --> F[Network Forensics]
F --> G[Firewall & Security Configuration]
G --> H[Nmap & Network Analysis]

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