Learn and practice the smart contract event module

We will inform you about all the security aspects of migration using MySQL and direct operation of DB Server.

This lecture will cover and implement websocket communication for chat servers used on streaming platforms such as Africa, Naver (Chijijik), and Twitch.

We covered the concepts considered while migrating 20 billion data items managed through the existing MongoDB to MySQL.

You will learn how to write queries against large amounts of data using MongoDB.

You can learn about webcam and peer-to-peer communication implemented using WebRTC.

In this course, you will learn how to create a Discord Bot. You can learn from simple messages to complex complexes.

It covers not only how to configure CRUD using Golang, but also how to use PostMan when collaborating with the front-end, and even repository management and environment construction! It contains the knowledge necessary for actual work.

This lecture covers the process of configuring a custom Gateway API using yaml.

In this lecture, you will learn how to use OpenTracing to perform distributed tracing across various applications.

We will inform you about the platform mass adoption method using AWS (S3, CloudFront) and MySQL (Geospatial Query).

We will tell you everything about how to build a server and perform uninterrupted deployment for stateful services such as Chijijik and AfreecaTV.

In this lecture, we aim to create a Web Scraping API server using the Naver Shopping site. We will show you how to configure a managed API server by connecting MySQL and configuring a 3-tier architecture!!

In this lecture, we will discuss how to reduce resources for server-to-server communication by implementing RPC and gRPC communications used in actual practice.

This is a content about backend development using two databases, MySQL and Mongo, for job seekers preparing for backend employment.

In this lecture, we will actually implement the core module of the blockchain indirectly through code. Through this process, you can learn in detail what the blockchain is and how it works. Actually, as someone who studies blockchain and works on blockchain-related tasks, most lectures focus on theoretical content or on using some functions called smart contracts. I wanted to make a difference from these lectures, so I prepared it so that you can indirectly create the core module by following my lectures one by one.

If Java has Spring and Python has Django, Node has NestJS! Learn Node's professional backend NestJS and Node's object-oriented programming and design patterns! This course is a membership subscription course, and if you purchase it once, you can take the continuously added NestJS techniques, DB, testing, etc.

We covered the concepts considered while migrating 20 billion data items managed through the existing MongoDB to MySQL.

Kotlin mastery via virtual payment server course.

You will learn the basics and advanced usage of GraphQL, the next-generation API control technology, and gain real-world project experience through a virtual kiosk service created with GraphQL. The course has been partially updated to the latest version, apollo-server v4, as of February 2024.

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.

In this lecture, we will actually implement the core module of the blockchain indirectly through code. Through this process, you can learn in detail what the blockchain is and how it works. Actually, as someone who studies blockchain and works on blockchain-related tasks, most lectures focus on theoretical content or on using some functions called smart contracts. I wanted to make a difference from these lectures, so I prepared it so that you can indirectly create the core module by following my lectures one by one.

After learning how to create GameFi blockchain games, you will try to develop your own blockchain game using the Phaser3 game engine.

This is a lecture that covers quite in-depth content. We will implement the very famous market, eBay. However, it is a completely decentralized version based on Ethereum and IPFS! This is a lecture that will walk you through the entire process of making the market run on Ethereum by writing all the core logic in Solidity.

You can understand metaverse technology in a short period of time, and we will teach you practical skills for creating metaverse worlds and issuing and selling NFTs without coding.

This course is a hands-on process where you'll build an NFT marketplace from scratch using frontend technologies and web3.js to leverage Solidity smart contracts. Students will implement all marketplace functions from NFT minting to selling, buying, and deleting, and deploy directly to the latest testnets including Ethereum Sepolia, Polygon Amoy, and Kaia Kairos networks. You'll also learn how to use IPFS for distributed storage of NFT images and metadata, experiencing a real service-ready DApp architecture that goes beyond simple demo-level implementations. ✨ Course Features Full-stack learning: React UI, smart contract development, and multi-chain deployment all in one Latest environment support: Sepolia·Amoy·Kairos testnet support, MetaMask integration Master core NFT processes: Image upload (IPFS) → Metadata generation → Minting → Marketplace transactions Practice-focused: Real service development experience including transaction handling, UX design, and multi-chain support

How to view safe indicators and objective data that should not be missed when investing in Bitcoin and altcoins, and share real airdrop know-how and practical methods that made it from 0 won to 100 million won

This is a must-see lecture for blockchain planners, developers, and company representatives. If you didn't have time to study separately, you can understand the core of the Bitcoin and Ethereum white papers through this summary lecture.

"There's data, but I don't know how to interpret it." This is the most common concern among people just starting with on-chain analysis. In this course, a 10-year veteran data analyst and on-chain researcher fully reveals all the tools and interpretation techniques used in real market analysis. ㆍWhich indicators react first before coin prices move ㆍWhether whales are accumulating or dumping ㆍHow to read market sentiment through bridge and stablecoin flows ㆍHow to extract data through Etherscan and Dune without programming ㆍAnd the interpretation patterns and strategies used by professional analysts This course is designed not to stop at "just looking" at on-chain data, but to help you build an analytical framework that leads to investment decisions.

This lecture covers the basics of crypto investment, including the value and risks of Bitcoin, Ethereum, and other Layer 1s (Cosmos).