October 3, 2025 - Hayden's Server Room

Express.js란? – Node.js 기반 웹 애플리케이션 프레임워크

웹 개발을 시작하면서 백엔드 서버를 직접 만들어야 하는데, 막막하셨나요? JavaScript로 프론트엔드는 다룰 수 있는데, 서버 개발은 또 다른 언어를 배워야 […]

What Is RAG? How AI Learns to Stop Making Things Up
If you’ve ever watched an AI confidently state something completely wrong, you’ve witnessed hallucination firsthand. RAG — Retrieval-Augmented Generation — is the architectural pattern… Read more: What Is RAG? How AI Learns to Stop Making Things Up
Excel XLOOKUP #SPILL! Error: How to Fix!
If you’ve upgraded to Microsoft 365 and suddenly your XLOOKUP formulas are throwing a #SPILL! error where nothing used to fail — you’re not… Read more: Excel XLOOKUP #SPILL! Error: How to Fix!
Meta’s AI Glasses — The Post-Smartphone Era Is Already Here
In 2026, a device that surfaces information in your line of sight without pulling out your phone — and lets you control it with… Read more: Meta’s AI Glasses — The Post-Smartphone Era Is Already Here
Notion AI vs Obsidian : Who Wins the Productivity Tool War?
In 2026, the two giants of the productivity tool market are still Notion and Obsidian. One is a San Francisco unicorn valued at $10… Read more: Notion AI vs Obsidian : Who Wins the Productivity Tool War?
Why Discord Owns Gen Z’s Online Communities
Ask a Gen Z college student what app they use to hang out with friends online, and the answer probably isn’t Instagram DMs or… Read more: Why Discord Owns Gen Z’s Online Communities