Do it! Introduction to Node.js Programming

A current database expert from a major global company generously shares 20 years of corporate practice and teaching experience!

Grab your keyboard and practice, and you'll master the three major web development skills!

Start drawing/calligraphy/designing with the authors of “Do it! Square iPad Drawing with Procreate”!

If you want to build a solid web foundation, come here!

Practical JavaScript Grammar for Frontend and Backend Let's finish it in one book with the #1 web book author!

Let’s learn about PWA (Progressive Web App), the next-generation mobile strategy of global companies!

An Android course taught directly by Dr. Jae-gon Jung, the author of the #1 best-selling Android book!! (2018 Revised Edition)

Practical JavaScript Grammar for Frontend and Backend Let's finish it in one book with the #1 web book author!

A course to learn the latest Node.js backend REST API using fastify, a Node.js framework boasting high speed, ORM Prisma, and Typescript.

JavaScript, TypeScript Next is backend development! You will be able to develop REST API backends using NestJS, develop and deploy Socket IO.

Python Web Development A to Z: Learning by Doing! Learn everything from web basics to blog development and deployment all at once.

At some point in backend development, you start to have these concerns. It's that moment when services expand and traffic increases, and you begin to feel the limitations of simple REST communication and CRUD structures. I experienced these same issues in the field and went through much trial and error balancing performance and structural complexity. The solution I chose during that process was NATS. Its simple configuration based on a single binary, ultra-low latency performance in microseconds, and the fact that it provides essential features—from Pub/Sub to Queue Groups and JetStream—without being overkill made it a very practical choice for real-world service environments. This course is not just a list of NATS features. Based on the problems I faced in practice, I explain through code and workflows why I chose NATS in certain situations and how I designed the architecture. This course is designed to help everyone—from those new to messaging systems to backend developers preparing for employment and senior developers considering better architectures—understand distributed systems and grow to the next level.

Build a solid foundation for your first start with Redis A to Z! Everything about Redis, explained so easily and fun that even a high school student can understand it perfectly.

You may have felt frustrated using Redis without being able to explain why it should be designed that way or why certain patterns emerged. Through my experience in both practical development and as an interviewer, I have treated Redis not just as a simple cache, but as a core component that determines service stability and scalability. This course is not about memorizing commands; instead, I will share my experiences on which structures to choose in real traffic environments and their trade-offs, helping you establish the criteria to explain these concepts confidently in both interviews and practical work.

This lecture clearly explains the concepts and operation principles of Promise and async/await in asynchronous programming in JavaScript, and helps you to skillfully handle asynchronous processing in practice.

This course is a practical, hands-on course where you will build your own 'League of Legends Match History Search Site' using React.js and Node.js, utilizing the Riot Games API. Students will naturally learn through hands-on practice, following the project step-by-step, covering everything from basic API usage, integration of frontend (React.js) and backend (Node.js, Express.js), to match history data visualization, and implementing op.gg-style UI. Rather than focusing on complex theories, this course is code-centric, allowing you to quickly experience results by 'building it yourself' through hands-on practice.

This is an advanced course on map service development, taught by the developer of CoronaMap.

This course focuses on helping beginner Javascript developers become developers who can develop Real web apps. If you take this course, you can learn the basic concepts related to Vue.js and develop Real web apps. This course is Part 1, Basics, and through Parts 2 and 3, we will implement Real web apps. It is structured so that you can learn easily even if you only know basic simple HTML, without prior knowledge such as Javascript or CSS. By the end of the course, you will definitely be able to do basic coding for Vue.js.

We teach you the core principles of clean code through easy example code.

🌟 From the basics of JavaScript to advanced levels, start with the Real! JavaScript course! 🌟

We will completely resolve the anxiety of those who felt frustrated by blindly copying AI-generated code without understanding the internal workings of HTTP or the causes of unexpected hanging.

This course is a practical, hands-on guide for those who want to learn how to maximize development productivity in the AI era. Beyond simply learning how to use AI, we focus on how to utilize Claude Code in a real-world development environment and how to produce "proper results." Many developers use AI but still face issues such as: ❌ Inconsistent results ❌ Poor code quality ❌ Increasing project complexity To solve these problems, this course teaches you how to utilize AI as a "development partner" rather than just a tool through: ✔ Spec-based workflows ✔ Structured command systems ✔ Sub-agent and automation strategies Furthermore, you will gain the experience of completing and deploying a full application from start to finish by integrating with real-world services such as Firebase, Figma, GitHub, and Vercel.

Through this lecture, students can create a web service similar to Instagram using HTML, CSS, and JS. (Only the front-end is implemented! The back-end server construction will be filmed in a later lecture.)

This course is for beginners and non-majors who want to properly learn the fundamentals of JavaScript. This course comprehensively covers everything from (1) understanding JavaScript concepts with various analogies in the shortest time possible to (2) getting familiar with the JavaScript language by writing practical JavaScript code.

This course will help you learn JavaScript through theory and practice. It explains step by step so that even beginners can easily understand. Part 2 covers JavaScript functions and events, types of functions, and core libraries.

We have created this so that anyone can pass the 2023 version of the Web Design Function Exam Criteria. Let's learn the 5 types and pass quickly!

We deal with ideas. You can logically organize the core and fundamentals of JavaScript. You can structure your own JavaScript experiences and thoughts. You can establish the technical logic of JavaScript. You can broaden your perspective to see the entirety of JavaScript. You can prepare for JavaScript technical interview questions.