A Comprehensive Summary of IT Infrastructure Basics: Essential Knowledge for Becoming a Long-Running Super Developer

This is Part 1 of a roadmap course that neatly organizes, in a short amount of time, the essential computer science (CS) knowledge you need to excel at development and data. This course has also been used for years as an in-house course at top companies in Korea. Based on 20 years of experience in the field, ranging from systems software to web and app development and data science, this course systematically and thoroughly covers the core concepts you need to excel at development and data—while keeping them easy to understand.

Beginner

Network, Computer Architecture, Operating System

Beginner Computer Science (CS Knowledge) Bootcamp | Computer Architecture, Operating Systems, Networking

funcoding

$102.30

Beginner / Network, Computer Architecture, Operating System

5.0

(8)

Learning from Others' Mistakes: Information Security Incident Analysis and Response Strategies through Real-World Cases

nullnull8537

Beginner / Malware, security, privacy, soc, security training

5.0

(3)

We will conduct an in-depth analysis of major domestic security incidents, such as personal information leaks from mobile carriers, the March 20 cyberattack, and the hacking of the Blue House. By examining the causes, damages, and response processes of each incident, we will understand the security threats facing modern organizations and individuals and learn practical prevention and response strategies.

Beginner

Malware, security, privacy

Learning from Others' Mistakes: Information Security Incident Analysis and Response Strategies through Real-World Cases

nullnull8537

Beginner / Malware, security, privacy, soc, security training

5.0

(3)

Infrastructure Workshop - Creating a Plausible Service

brainbackdoor

$42.90

Basic / Network, Linux, Spring Boot, AWS, MySQL

5.0

(15)

400+

This course proceeds in stages where you learn and apply necessary knowledge while building infrastructure, similar to real-world practice.

Basic

Network, Linux, Spring Boot

Infrastructure Workshop - Creating a Plausible Service

brainbackdoor

$42.90

Basic / Network, Linux, Spring Boot, AWS, MySQL

5.0

(15)

400+

Getting Started with Docker and Containers

rex

Basic / Docker, container, docker-compose, cloud-computing

4.8

(18)

Docker? It's not difficult at all. I'll explain the key points briefly and clearly. Learn, apply, and understand quickly!

Basic

Docker, container, docker-compose

Getting Started with Docker and Containers

rex

Basic / Docker, container, docker-compose, cloud-computing

4.8

(18)

IT Infrastructure Design for Beginners: From Requirements to the Design Proposal

rebalancesys

Early Bird

20%

Basic / system-design, infrastructure, technical writing

New

For practitioners who find it difficult to translate requirements into designs, I guide you through everything from the basis for decisions to completing the documentation, drawing on hands-on infrastructure design experience.

Basic

system-design, infrastructure, technical writing

IT Infrastructure Design for Beginners: From Requirements to the Design Proposal

rebalancesys

Early Bird

20%

Basic / system-design, infrastructure, technical writing

New

Understanding 5G Networks

joshuachun

Beginner / 5g, Network, Virtualization

4.8

(8)

This is a course to comprehensively understand 5G networks. We will look at the evolution from 1G to 5G and learn about the characteristics and architecture of networks including 5G RAN and 5GC.

Beginner

5g, Network, Virtualization

Understanding 5G Networks

joshuachun

Beginner / 5g, Network, Virtualization

4.8

(8)

Certificates and TLS

woojuyun

$38.50

22%

$29.70

Beginner / tls, openssl, Network, ssl-handshake

4.4

(17)

Understand the basics of security algorithms and certificates, and learn about TLS based on this.

Beginner

tls, openssl, Network

Certificates and TLS

woojuyun

$38.50

22%

$29.70

Beginner / tls, openssl, Network, ssl-handshake

4.4

(17)

Cloudflare WAF for DevSecOps, & Cloud Security Engineers

amrit

$11.00

Beginner / security, waf, devsecops, cloud-computing, cybersecurity

5.0

(2)

Mastering Threat Mitigation, Custom Rules, and API Protection for Modern DevOps Pipelines

Beginner

security, waf, devsecops

Cloudflare WAF for DevSecOps, & Cloud Security Engineers

amrit

$11.00

Beginner / security, waf, devsecops, cloud-computing, cybersecurity

5.0

(2)

IT Essential Knowledge - Properly Learning Network Fundamentals

usefulit

Beginner / Network

4.1

(8)

This course is designed to learn the fundamentals of networks that form the foundation of the internet. It is structured to help you understand the basic concepts and structure of networks and systematically learn the principles of internet communication. Learners will acquire foundational theoretical and practical knowledge about networks, establishing a foundation for learning in the IT and information communication fields.

Beginner

Network

IT Essential Knowledge - Properly Learning Network Fundamentals

usefulit

Beginner / Network

4.1

(8)

Docker Essentials - Getting a Feel for Containers & Docker

skilleat

$51.70

Beginner / Docker, CI/CD, infrastructure, container

5.0

(11)

This is not just a lecture for memorizing commands. It is a practical introductory course designed to help you intuitively understand the "flow" of technology—why containers emerged and the principles behind how Docker creates and runs images. Even those new to Docker will be able to explain for themselves "why containers are a necessary technology" after taking this course.

Beginner

Docker, CI/CD, infrastructure

Docker Essentials - Getting a Feel for Containers & Docker

skilleat

$51.70

Beginner / Docker, CI/CD, infrastructure, container

5.0

(11)

Linux Permission Masterclass – "From Basics to Practical Application, Security, and Service Operations"

linuxmasternet

Basic / Linux, Operating System, security, security training

5.0

(3)

This course puts an end to operational vulnerabilities in Linux servers caused by incorrect permissions. Completely master file and directory permission control based on real-world practical standards.

Basic

Linux, Operating System, security

Linux Permission Masterclass – "From Basics to Practical Application, Security, and Service Operations"

linuxmasternet

Basic / Linux, Operating System, security, security training

5.0

(3)

Building a cloud environment using OpenStack

kisecedu1643

$26.40

Basic / openstack, Google Cloud Platform, Network, Architecture, 3-tier

4.1

(31)

This training will help you understand the world-famous cloud, build your own cloud environment, and strengthen your ability to use it easily.

Basic

openstack, Google Cloud Platform, Network

Building a cloud environment using OpenStack

kisecedu1643

$26.40

Basic / openstack, Google Cloud Platform, Network, Architecture, 3-tier

4.1

(31)

HTTP Web Basics for Every Developer

Basic / Network

5.0

(4,071)

37,200+

Learn the core HTTP features essential for practical use and how to design proper HTTP APIs.

Basic

Network

HTTP Web Basics for Every Developer

Basic / Network

5.0

(4,071)

37,200+

Making an Online Omok Game Alone with Unity 6: Implementing Unity + C# Server

kosart

$84.70

Basic / Unity, C#, Network, Unity6

5.0

(2)

Creating a simple Omok game using Unity and a C# server

Basic

Unity, C#, Network

Making an Online Omok Game Alone with Unity 6: Implementing Unity + C# Server

kosart

$84.70

Basic / Unity, C#, Network, Unity6

5.0

(2)

Security Basics Every Web Developer Should Know

Jason

Free

Basic / Cryptography, Network, Python, pycryptodome, owasp

4.8

(84)

3,200+

Information security is difficult and too technical? No. Start learning the basics of information security to create a secure web right now!

Basic

Cryptography, Network, Python

Security Basics Every Web Developer Should Know

Jason

Free

Basic / Cryptography, Network, Python, pycryptodome, owasp

4.8

(84)

3,200+

Network Programming That Will Change Your Life When You Understand It

nullnull8537

$59.40

Intermediate / npcap, winpcap, vc++, Network, tcpip

4.9

(48)

1,100+

This course is for those who want to develop packet analysis programs like Wireshark and various network solutions using the Npcap library.

Intermediate

npcap, winpcap, vc++

Network Programming That Will Change Your Life When You Understand It

nullnull8537

$59.40

Intermediate / npcap, winpcap, vc++, Network, tcpip

4.9

(48)

1,100+

NGINX for 1,000,000++ TPS, Explained by a Naver Interviewer

Hong

Beginner / JavaScript, Linux, nginx, reverse-proxy, infrastructure

4.7

(25)

This course focuses not simply on how to configure NGINX, but on solving the problems that arise in interviews and real-world work when you do not understand why these structures and configurations are necessary. Based on experience serving as an interviewer at Naver, Kakao, and Toss and evaluating countless candidates, the course explains, with hands-on practice, how to describe and use NGINX from the perspectives of performance, scalability, and operations. The core of this course is helping you develop a way of thinking that allows you to understand traffic flow and track down problems, rather than merely memorize configuration values.

Beginner

JavaScript, Linux, nginx

NGINX for 1,000,000++ TPS, Explained by a Naver Interviewer

Hong

Beginner / JavaScript, Linux, nginx, reverse-proxy, infrastructure

4.7

(25)

2026 CPPG Certification Acquisition Course (Latest Edition)

ISMS-P WIN

$304.70

Basic / security, CPPG

4.8

(52)

Update

This is the CPPG WIN course, the shortcut to obtaining the CPPG certification. It is a theory course designed to help you pass the 2026 CPPG certification exam, reflecting the trends from the most recent 13 exams.

Basic

security, CPPG

2026 CPPG Certification Acquisition Course (Latest Edition)

ISMS-P WIN

$304.70

Basic / security, CPPG

4.8

(52)

Update

Network, Let's Understand with Animation and Illustrations (2025ver.)

artprogrammer6403

$58.30

18%

$47.30

Beginner / Network, Protocol, Wireshark

4.9

(72)

500+

Learn about networks easily, quickly, and engagingly with pictures and videos!

Beginner

Network, Protocol, Wireshark

Network, Let's Understand with Animation and Illustrations (2025ver.)

artprogrammer6403

$58.30

18%

$47.30

Beginner / Network, Protocol, Wireshark

4.9

(72)

500+

[CS Technical Interview 3] Network that gets you talking

yiyj10305235

Beginner / Network, Tech Interview, computer-science

4.9

(28)

600+

A course where you can understand core network concepts and train to explain them verbally for interviews.

Beginner

Network, Tech Interview, computer-science

[CS Technical Interview 3] Network that gets you talking

yiyj10305235

Beginner / Network, Tech Interview, computer-science

4.9

(28)

600+