Certificates and TLS

Arduino? Coding? You don't need to know anything. Just invest a little bit of your free time and you'll find something amazing.

Master AWS networking completely! Learn VPC, subnet, routing, and security with a focus on practical application, and design secure and scalable cloud network architectures. Complete the core skills that every working engineer must know in a short period of time!

Information security solutions—you may have heard of them, but do you know their exact roles and differences? A variety of information security solutions are used by businesses, including firewalls, IDS, IPS, WAF, DLP, and EDR! Understanding exactly what role each one performs, how it works, and in what situations it is used is an important first step toward developing your information security skills. A complete beginner’s guide to information security solutions (systems), designed for easy learning! Learn complex security technologies easily and systematically, starting from the basics.

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

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.

We will show you how to use Wireshark to check actual network packets and perform everything from HTTP communication analysis to web vulnerability attack detection and malware communication analysis. We explain everything step-by-step starting from the OSI 7 layers so that even beginners without a network foundation can follow along. After taking the course, you will be equipped with the practical skills to find and analyze the specific packets you want.

This course will help you understand the value of IoT and how it changes our lives and society. You will learn the basics of IoT device programming, IoT device connection technology, big data analysis, and automation. You will understand digital transformation and its impact on businesses and society.

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

[An Introduction to Security Incident Response Through Scenarios of Web Server Hacking, Ransomware, and Account Takeovers] This course examines why various information security incidents—including web server hacking, ransomware, account takeovers, and internal intrusions—occur and how they spread, organized by incident type. By following each incident scenario, learners will understand the attack flow, analyze the key causes of the incident, and learn how to resolve the issue and prevent recurrence through security structures such as firewalls, DMZs, access control, privilege management, backups, and log monitoring. Rather than simply explaining basic security concepts, this scenario-based introductory information security course provides a comprehensive understanding of everything from analyzing the causes of security incidents to determining how to resolve them.

Learn about the network multiplayer framework, also known as the other Unreal Engine. Learn the key concepts, inner workings, and optimization techniques you need to know when creating a network multiplayer game, then create a hack & slash type PvP battle game.

This is a course where you create a mini RPG 2D game to learn 2D development techniques, and then learn the process of converting the completed game into a network game by transitioning it to Netcode for GameObject. It covers various essential tilemap functions for 2D games, and is designed to naturally help you learn clean code writing techniques that adhere to SOLID principles. Additionally, this is a lecture that builds the foundation for network games using the updated Netcode API in the latest Unity 6 version.

This course covers the basics of Amazon EKS, an AWS-managed Kubernetes service, designed for beginner Amazon EKS users.

For those aiming to pass the "Network Specialist Examination": This course is a learning program that condenses only the key points of the IPA Network Specialist Examination. It focuses on themes directly connected to passing the exam and is designed to help you acquire knowledge efficiently. Rather than emphasizing volume, we carefully select and explain "the essential parts you must master to pass"! Let's work hard together toward passing the Network Specialist exam!

Free lecture by the author of the best-selling book, “Network Study Alone.” A summary of a network textbook that developers must know.

Network studies that you give up on every time because they are difficult and boring. Finish it once and for all with this textbook.

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.

How do the sites we access every day work? Before we start studying data in earnest, let's take some time to learn about servers and the Internet, which are the background knowledge of IT.

If you want to work for a long time as a super developer who can handle the entire process of service development and operations alone, building a solid foundation in IT infrastructure knowledge is just as important as learning various programming languages!

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

Let's leverage AWS's key networking services to build everything from simple, basic networks to multi and hybrid networks, understand traffic flow in the architecture, and develop the skills and confidence to implement real cloud networks ourselves.