The Easiest Data Structures and Algorithms - by Yalco

This is a hands-on OpenAI Codex course for both non-developers and developers. You’ll learn everything from the basics to building websites and programs, automating tasks, harness engineering, and advanced features with ease, while developing the ability to learn new features independently using the latest official documentation.

A friendly course that even those who know nothing about coding can follow! The ultimate course that turns working developers into JavaScript experts!

Even those who know nothing about coding will be able to create their own automated stock trading program by giving commands to AI in Korean!

In the AI era, you may not need to know coding, but you must know Git. The easiest and most detailed way to learn Git & GitHub

A kind and easy course that even those who know nothing about coding can follow! The ultimate course that turns working developers into HTML & CSS experts!

Learn React the easiest and fastest way with Explainer Captain Yalco's rich and solid course!

An era where just learning the basics isn't enough to survive. Dig deep and master Java once and for all!

Quickly learn TypeScript's syntax and usage with the easiest explanations.

Through the 25 patterns of OODP, you will learn various ways to design software in an object-oriented manner.

⚡ Short and sweet 90-minute course! Copy and paste the site's code to quickly learn GraphQL and how to use Apollo.

This course covers the core principles and practical techniques of Node.js that you must know before diving into professional frontend and backend development.

⚡ Short and sweet full 160-minute course! Copy and paste code from website to website and learn reactive programming with ReactiveX 😎

MySQL for non-majors! This lecture quickly skims through essential concepts with brief explanations, then allows you to learn MySQL hands-on by "playing" with examples on the site.

This course covers the latest data structures and algorithms used in representative open sources such as Linux.

Let's learn various data structures and algorithms and develop practical skills by implementing them through programming!

✅ Out of the entire series (1) ~ (7), (4) data structure, algorithm, object-oriented, programming language ✅ CS101 series lectures - From basic computer theory to the latest practical examples - Provides a wide range of basic knowledge

Build your coding skills by implementing data structures in Java from the ground up.

Are you a non-major who doesn't know how to start learning C language? Did you learn C language as a major in school, but still can't write code? What's the point of studying C language for a long time? When you can't even create a single line of code properly... I'll pass on the know-how so you can program yourself. In this course, together with an experienced senior developer, you'll gradually learn C language grammar and application methods, and I'll guide you to a level where you can work on simple projects.

Learn the principles of Diablo 1-style PCG dungeon generation by implementing its structure in the console, with the theme 'Technology Supporting Game Development in the AI Era'. Expand this to 3D in Unity to complete a generation pipeline equipped with seed-based dungeon generation, mesh placement rules, and debug tooling. Through sample code and hands-on practice, connect to AI-assisted art production workflows, enabling you to create immediately applicable dungeon crawler prototypes.

This is an online lecture that systematically organizes pathfinding and spatial partitioning algorithms used in game production.

The Code Puzzle Clear Challenge is a 4-week intensive training course based on "Learn to Code 1" in Swift Playgrounds, designed to develop "computational thinking" by giving commands to make a computer move as intended. By solving puzzle missions in each session, participants naturally learn to break down problems into smaller steps (decomposition), recognize patterns to organize repetitive rules using for-loops or functions, and make logical judgments to change actions based on specific situations. Beyond simply finding the right answer, participants reach a level where they can explain and refine "why they solved it this way."

For learners just starting programming, C can feel difficult because of unfamiliar concepts such as variables, operators, conditional statements, loops, functions, arrays, and pointers. This course is an introductory C programming course taught directly by Professor Chang-Hyun Lee, the author of *C Language on My Own* and a developer with 25 years of experience. Rather than simply memorizing C syntax, the course explains step by step why each piece of syntax is needed, how it works in a program, and how to solve real-world problems with code. Starting with the fundamental concepts of programming, you will learn the core basics of C one by one, including variables and data types, operators, conditional statements, loops, functions, arrays, and pointers. Assignments for each part also provide hands-on experience writing code and solving problems using what you have learned. Drawing on 25 years of experience in development and education, this course guides beginners in C programming so they can build a solid foundation in the fundamentals of programming.

When learning Swift, the iOS programming language, it can be confusing when multiple concepts appear all at once. That's why I created this course with the principle that "when understanding a new concept, only previously learned concepts should be used." So this course is meticulously designed with a sequential structure between concepts, where only one new concept appears at each stage, and no other unfamiliar concepts appear at all. One concept per minute, 180 concepts total. From the basics of variables and constants to understanding memory structure from a CS perspective, and even the latest syntax for asynchronous processing. In 3 hours, you'll learn 180 core concepts in the designed order.

This is a game development & algorithm course that focuses on the algorithms and principles of 2D game development from the ground up using Windows API and C++.

Even if you know nothing about coding, you can create your own scheduling app in just 4 weeks. Simply tell the AI, "Make an app like this," and paste the code you receive into Swift Playgrounds. Over 12 sessions—3 times a week, 30 minutes a day—you will complete a real app featuring adding/deleting/editing schedules, categories and notifications, filters and search, and even a calendar view. Don't worry if you run into errors; just ask the AI, and it will fix them for you. Start the challenge now to learn how to collaborate with AI, rather than just studying coding!