React for Beginners: Building a Solid Foundation

You can't talk about web programming without knowing DOM. Covers over 95% of the DOM specification. You can put a period on DOM. It's broad, deep, and detailed. No time, money, or effort wasted. Also covers JavaScript usage, and you can develop web applications with vanilla JS.

The final course of JavaScript! It covers the structure and method of the execution context, Event Loop, and multi-threading based on ES2025. It covers the language culture contained in the JavaScript language.

It covers thinking. You can logically organize the core and fundamentals of JavaScript. You can organize your own JavaScript experience and thoughts. You can establish the logic of JavaScript technology. You can broaden your perspective on the entire JavaScript. You can prepare for JavaScript technical interview questions.

You can learn React's state and hook in a broad, deep, and detailed way. It covers more than 95% of the official React documentation. You can finish React with this course.

Most system development failures or requirement changes occur due to faulty requirements analysis. This covers how to implement requirements analysis to ensure successful system development. Requirements are addressed with scenarios, not code. This covers how to address requirements with scenarios.

DOM is the foundation and essential part of dynamic applications. We cover everything from the basics to the advanced use of all events that occur in Element, Document, and Window objects. You can fully learn and use Web Components (Custom Element, Shadow DOM, Template). You can put an end to DOM with the newly opened course, "Complete DOM: Basics."

This is the last lecture of the JavaScript Bible course consisting of 4 lectures. It covers more than 95% of the JavaScript specification. In particular, it approaches the concept of creating a framework by dividing the entire asynchronous communication and asynchronous process into 11 steps.

We will cover the concept of machine learning in a JavaScript environment. We will cover the form and code of implementing machine learning with JavaScript and TensorFlow.js.

This is the third lecture in the JavaScript Bible course consisting of 4 lectures. It covers more than 95% of the JavaScript specification. You can develop new paradigm programs in the ES6+ environment.

This is the second lecture of the JavaScript Bible course consisting of 4 lectures. By understanding the JavaScript engine, you can develop programs optimized for JavaScript. You can design systems with confidence.

This is the first lecture of the JavaScript Bible course consisting of 4 lectures. It is faithful to the basics. It focuses on understanding the fundamentals of JavaScript. It covers more than 95% of the JavaScript specification.

This is the first lecture of the JavaScript Bible course consisting of 4 lectures. It is faithful to the basics. It focuses on understanding the fundamentals of JavaScript. It covers more than 95% of the JavaScript specification.

Master React now. Easiest course to grasp React's features & roles, comparing to pure JS!

This is not just a lecture you listen to and forget. This course aims not for "the moment you understand React" but for "the moment you can actually handle React." In every section, you'll complete missions alongside the lectures, solve practice problems directly, and learn by implementing core concepts like JSX, Virtual DOM, State, and useEffect with your own hands. When you complete the course, you won't just be a beginner who knows React syntax, but a developer who can explain and utilize everything from component design to rendering flow on your own. "Not just a class you listen to, but learning you build to completion." Understand the essence of React and experience the world of declarative UI firsthand.

Online bootcamp in Jeju! Create your own service quickly! :)

In the era of swift execution and validation, execute faster than anyone with VIBE Coding! Achieve complete monetization, from ads to payments, all by yourself.

This is a project-centered course that builds a "To-Do List Management App" with practical skills using React + TypeScript. Rather than just learning syntax, you can develop a sense for TypeScript application by completing it as an actual service through component structure design → state management → type application → feature implementation → local storage integration → deployment.

No matter how much you study React, Next.js, or Vue, if the code feels abstract and the structure isn't clearly understood, the root cause might be a lack of understanding of DOM. DOM is the foundation of all frontend frameworks and the entity that connects the structure and behavior of web pages. This lecture goes beyond simple selectors or manipulation methods, teaching step-by-step from the very beginning how HTML transforms into DOM objects and how to select, traverse, and manipulate this structure. It is the Part 1 introductory lecture of 'Complete DOM Mastery'. HTML tags are just structure, and JavaScript is just behavior, but DOM is the core that connects the two. If you clearly understand this connection, you'll be able to precisely grasp the true structure and flow within any framework you use.

In this course, you will learn about TypeScript.

🔥 Build a customized platform for Hanja learning! Leverage Google Gemini AI and Firestore to directly implement your own Hanja vocabulary book, stroke order animation, and even handwriting recognition!

In many programming languages, including Javascript, asynchronous operations are one of the most difficult and complex elements of software. You can discard primitive asynchronous programming such as setTimeout and setInterval and easily handle complex asynchronous operations through RxJS.

A Complete End-to-End Developer Journey — Build Lightning-Fast APIs, Modern Frontend Interfaces, Real Projects, Authentication Systems, Dashboards & Full Deployments Using FastAPI, React, and Vibe Coding Techniques.

This is a Unity C# scripting course for absolute beginners who are learning programming for the first time. It was created by carefully selecting the core grammar necessary for utilizing Unity scripts.

Let's learn together the official React documentation that has been renewed in 2023.

This course goes beyond simply using Express.js. You will rebuild its internal engine from start to finish, gaining hands-on experience with the real principles of how a server works. By directly creating each component of Express—such as routing, middleware, request–response objects, static file handling, and template rendering—you will grow as a server developer and truly understand how a framework operates at its core.

Let's learn the C# language. You can learn it even if you don't know the C language. The development tools are also installed from the beginning.

It covers thinking. You can logically organize the core and fundamentals of JavaScript. You can organize your own JavaScript experience and thoughts. You can establish the logic of JavaScript technology. You can broaden your perspective on the entire JavaScript. You can prepare for JavaScript technical interview questions.

OODP's 25 patterns teach various methods for object-oriented software design.

Web developers (especially React developers) can now truly easily launch apps. With Expo, you can launch both Android and iOS apps even faster. Let's become a developer who can quickly launch apps with Expo.

mongoDB, NoSQL You hear a lot these days, but is it still an unfamiliar database? Aren't you using it like a relational database (RDS/SQL)? No matter how good the technology is, if it's not used correctly, it will have the opposite effect. That's why we often see cases of failure in using MongoDB. This lecture will teach you everything from basic concepts to practical know-how so that you can use MongoDB as MongoDB-like as possible.

A current startup CTO will share vibe coding knowledge gained through actual services and various outsourcing projects.