A clearer path through information security
Read→Practice→Make it yoursYOUR NEXT SKILL STARTS HERE
From the first command
to deeper security skills.
Know what to learn, and where to go next.
Follow a connected path of 348 steps across 5 levels.
No login neededKorean · EnglishFoundations to practice
THE BIG PICTURE
Your learning path, at a glance
Select a level to see the skills and lessons inside.
INSIDE THIS LEVEL · LEVEL 00
Computer foundations
Learn your way around terminals, operating systems and networks.
Start here with no prerequisitesYOUR FIRST THREE LESSONS
001First Steps in PowerShell — Driving Your Computer with Text002Working with Files — Create, Copy, Move, Delete003The Pipe (|) — A Way of Thinking That Assembles Commands40LESSONSExplore this levelStart with any lesson.
INSIDE THIS LEVEL · LEVEL 01
Code & systems
Build with Python and C, and explore how computers work.
Comfortable with Level 0 fundamentalsYOUR FIRST THREE LESSONS
041Setting Up Python and Your First Code — The Day You Build Your Workbench042Data Types in Depth — Four Baskets for Holding Values043Conditionals and Loops — Code That Decides and Repeats55LESSONSExplore this levelStart with any lesson.
INSIDE THIS LEVEL · LEVEL 02
Security practice
Explore attack principles and responses in learning labs.
A foundation in programming and networkingYOUR FIRST THREE LESSONS
096Bandit 0–5 — The Wargame Solving Cycle097Bandit 6~10 — Mastering Conditional Searches with find098Bandit 11~15 — Encoding and Network Connections80LESSONSExplore this levelStart with any lesson.
INSIDE THIS LEVEL · LEVEL 03
CTF & specializations
Practice web security, pwn, reversing, cryptography and forensics.
Experience with introductory security labsYOUR FIRST THREE LESSONS
176CTF First Taste 1: Five Web Challenges — Entering the Real Arena177CTF Taste Test 2: Pwn Challenge (pwnable.kr) — First Encounter with a Binary178CTF Taste Test 3: Reversing — Two crackmes + Ghidra — How to Read Without Source128LESSONSExplore this levelStart with any lesson.
INSIDE THIS LEVEL · LEVEL 04
Research & practice
Continue through advanced labs, research, competitions and a portfolio.
Ready for advanced practice and projectsYOUR FIRST THREE LESSONS
304Understanding the OSCP Exam and a Preparation Roadmap — The Rules of the 24-Hour Practical Battlefield305Taking Down Practice Machines Begins — One Report per Machine306The Thoroughness of Enumeration — The Reality of "Try Harder"45LESSONSExplore this levelStart with any lesson.
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