First Steps in JavaScript for Web Frontend

If you’ve learned JavaScript, take your skills to the next level with TypeScript. Build a solid foundation in the TypeScript essentials needed for modern frontend development with React, Next.js, and more through hands-on practice covering basic types and type inference, interfaces, function types, generics, utility types, and more.

If you’ve learned HTML/CSS, it’s time to make web pages interactive with JavaScript. Build a solid foundation in JavaScript by learning programming basics such as variables, functions, arrays, conditional statements, and loops, along with controlling DOM elements, handling events, and implementing UI components like tabs and accordions—then take the next step toward frontend learning with React and other technologies.

We introduce the main concepts, grammar, and utilization methods of JavaScript, the programming language that runs websites. This is an introductory JavaScript course that even those who are just starting out with HTML/CSS can easily understand.

A three-in-one class where you can create web games and learn front-end web development skills! This class has been created to teach you how to create games using JavaScript, CSS, and HTML with your own ideas!

The Ultimate JavaScript Course! It covers execution context structures and mechanisms based on ES2025, the Event Loop, and multi-threading. It also explores the language culture embedded within JavaScript.

Are you feeling anxious because you've only been following along and copying code? We’ve packed this with the core principles of how the web works and the criteria for choosing technologies, without just focusing on implementation. From foundational concepts to React 19 and Vite 7, we will help you draw the big picture for frontend development in 2026!

You no longer need to study JavaScript and ES6 separately. This course is designed to learn the JavaScript programming language along with the latest ES6 grammar.

Creating a responsive webpage using Bootstrap (BOOTSTRAP) [2024 Revised Edition]: As a practical production class, we will directly create a responsive web page for practical use with a layout that changes depending on the device, using Bootstrap 4.

For over 15 years, Young Codi Kim, a star coding instructor, has been dedicated to coding education for elementary school students, high school students in IT software departments, university students in computer science, and job seekers without a major in the field. Now, you can experience Kim's easy and fun coding lectures not only offline but also online. With Young Codi Kim, who has trained over 500 front-end, back-end, full-stack, and web developers, your dream of becoming a developer will soon become a reality!

This is a revised version of a lecture on how to use Bootstrap to create responsive web pages that change layout depending on the device.

This is a Life Coding JavaScript course. We will study the JavaScript reference that allows you to directly control the web browser.

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.

This is a TodoList tutorial taught in the simplest way by a third-year frontend developer.

It’s an easy and fun click-through lesson. You can use it as a reference for the direction of your portfolio.

It covers machine learning concepts within the JavaScript environment. It covers the patterns and code for implementing machine learning with JavaScript and TensorFlow.js.

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

I have summarized how to create a profitable AdSense website. I have organized it so that even those without development experience can follow along, leaving only successful methods so that they can be replicated exactly.

"2026 UIUX Designer | Coding Designer Agency Pass Portfolio Reveal" This is a practical lecture on creating a UIUX web portfolio that catches the interviewer's eye. The curriculum is designed not just for simple portfolio creation, but to enhance your competitiveness as a UIUX designer with differentiated results utilizing interactions.

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.

With a practical example, we will design and develop a web application using Spring Boot and JPA. Through this process, you will understand how to use Spring Boot and JPA in practice.