Learn security, systems, and CS without paywalls.

Structured notes, labs, and project roadmaps for learners building real technical confidence.

Built by lokii for learners, open for contributions, and part of a movement for free quality education.

Compsci Cybersec Networking Shell Certificate prep GRC Linux Tools Sys admin SOC analyst awk sed grep Vim Nmap Wireshark
Browse notes View project roadmap

Learning library

Available resources

Each path is grouped by difficulty, with topic keywords showing what is inside before you expand it.

1.1
What is Cybersecurity?
Introduction to cybersecurity, the CIA triad, and digital security landscape
 1.2
Cybersecurity Glossary
Comprehensive A-Z reference for terminology and acronyms
 1.3
The Cybersecurity Landscape
Threat actors, attack vectors, and defense strategies
 1.4
Introduction to Operating Systems
From Stallman to Linus: OS history and practical skills
1.5 Networking
1.5
Networking Overview
Introduction to networking concepts
 1.5.1
Network Fundamentals
Core networking concepts, types, and topologies
 1.5.2
OSI & TCP/IP Models
Data flow, encapsulation, and layer functions
 1.5.3
Protocols & Ports
TCP vs UDP, common ports, and vulnerabilities
 1.5.4
Network Devices
Routers, switches, firewalls, and security implications
 1.5.5
WiFi Explained
Wireless fundamentals, security, and technologies
1.6
Access Control
ISC2 CC Notes - DAC, MAC, RBAC, and authentication
 1.7
Shell Scripting Basics
Variables, loops, conditionals, and writing your first scripts
 1.8
Shell Scripting Practice
10 realistic cybersec & DevOps scenarios with solutions
 1.9
GRC Foundation Guide
Governance, risk, compliance, controls, evidence, and risk-register fundamentals
2.1
Linux Mastery Course
Complete 17-module Linux command-line and cybersecurity course
 2.2
Practical Linux Guide
Step-by-step Linux field commands for recon, health checks, processes, networking, users, logs, packages, and evidence handling
CLI Tools Mastery
2.3.1
grep Mastery Guide
Text processing and pattern matching
 2.3.2
sed Stream Editor
Text transformation and data manipulation
 2.3.3
awk Programming Language
Data extraction, processing, and reporting
 2.3.4
Vim & Neovim Mastery
Modal editing from zero to lightning speed
 2.3.5
Nmap Network Scanner
Network discovery, port scanning, and security auditing
 2.3.6
Nmap Cheatsheet
Five master scan workflows for fast local-lab action
 2.3.7
Log Processing Mastery Cheatsheet
Fast grep and awk workflows for finding brute-force patterns in long logs
Networking Interview Prep
2.4.1
Networking Study Guide - Part 1
Levels 01-05: Fundamentals, subnetting, switching, and routing
 2.4.2
Networking Study Guide - Part 2
Levels 06-10: Dynamic routing, services, security, WAN, and troubleshooting
2.5
GRC Intermediate Guide
Risk registers, control testing, audit readiness, vendor risk, evidence, and reporting
3.1
Security Professional Project Guide
Operating systems, networking, Linux, automation, blue team, web security, cloud, cryptography, identity, and portfolio projects
 3.2
Wireshark Packet Capture Analysis
PCAP reading, Wireshark filters, SOC-style workflow, Nmap reconnaissance evidence, and incident reporting discipline
 3.3
GRC Professional Guide
Enterprise risk, assurance, control design, cloud, privacy, automation, executive reporting, and strategy
 3.4
Incident Response Report: Vendor VPN Data Exfiltration
Compromised third-party VPN access, lateral movement, database exposure, IOCs, MITRE mapping, findings, and response actions
 3.5
Incident Response Report: Nagarik App Environment Exposure
Exposed environment files, leaked secrets, database access, data exfiltration analysis, containment, recovery, and long-term improvements
More Pro Guides Coming Soon

A clear route through the material

Pick the level that matches where you are today.

The site is organized so you can build fundamentals first, practice real tools next, and then turn the work into stronger security projects.

Intro

Build your base

Cybersecurity basics, terminology, operating systems, networking, access control, shell scripting, and GRC foundations.

 Intermediate

Practice the tools

Linux mastery, grep, sed, awk, Vim, Nmap, VLANs, networking interview prep, and applied GRC workflows.

 Pro

Show professional work

Security project planning, Wireshark packet analysis, professional GRC, incident response reports, portfolio evidence, and reporting discipline.

About and FAQ

The project stays focused on useful learning.

Why lokii.tech?

lokii.tech exists to make CS and cybersecurity learning clear, structured, and practical. It guides learners from beginner-friendly foundations to real tools, workflows, projects, and professional thinking, helping them build confidence and turn learning into real evidence of skill.

The site is open to useful corrections, clearer notes, extra resources, and meaningful contributions in the direction of the objective.

What is the goal of the project?

The goal is to make quality education freely accessible, structured, practical, and meaningful. The project follows the FOSS spirit: share useful work, let people inspect and improve it, and keep a serious learning path open for the next learner.

Who should use this site?

Students, self-taught learners, and early security practitioners should use this site if they want practical computer science and cybersecurity notes without getting buried in random tutorials or paid course funnels.

Where should a beginner start?

Start with the Intro Level resources. Cybersecurity basics, operating systems, networking, access control, and shell scripting are ordered to build the foundation before tools and projects.

How are the notes designed?

The notes are designed to turn learning into practice. Each guide explains the concept, why it matters, how it applies to real technical work, and what to do next. Many notes also include practice questions, practical tool guides, cheat sheets, examples, and after-note activities to support clear, structured, and meaningful learning.

What makes the project material useful?

The Pro Level material focuses on portfolio-ready work: scope, time estimates, deliverables, analysis discipline, incident response reports, and lessons learned. It helps people stuck in tutorial loops build meaningful projects in a clear stepwise way.

What other things can I check out?

You can also explore my other community-focused projects, including Fisholophy for writings and reflections, Fumic for offline media playback, Frodigy for productivity and tracking, and my professional profiles at saksham.info.np and sakshamsharma.com.np.

How can I contribute?

Contribute through the lokii.tech GitHub repository. Open an issue for corrections or suggestions, or send a pull request when you want to improve notes, links, structure, examples, or clarity.

Open GitHub issues