Tips & Guides
Practical articles to help you get the most out of everyday digital tasks.
🖼️ Image & Design
Is It Safe to Upload Photos to Online Tools? How to Check for Yourself
How to tell whether an online image tool uploads your photo or processes it in your browser, using the Network tab in Chrome or Edge — plus a few habits worth having before you upload anything.
Image Size Guide for Instagram, YouTube, and Social Media
A complete reference of recommended image dimensions for every major platform. Learn how to resize your images to exact pixel sizes before uploading.
How to Remove Image Backgrounds for Free
A step-by-step guide to removing backgrounds using AI in your browser — no installation needed. Covers e-commerce product photos, profile images, and more.
How to Reduce Image File Size — PNG, JPG, and WEBP Explained
A practical guide to image compression: the differences between PNG, JPG, and WEBP, when to use each format, and how to reduce file size without visible quality loss.
PDF and Image Conversion Guide — When and How to Use Each
When should you merge images into a PDF vs. extract PDF pages as images? This guide explains the best use cases for each direction and what to watch out for.
Color Combination Basics — Complementary, Analogous, and Triadic Colors
A beginner-friendly guide to color theory: complementary, analogous, triadic, split-complementary, and monochromatic combinations explained with practical design tips.
Free Image Editing Tools Compared — Canva, Figma, and Alternatives
A hands-on comparison of free image tools: Canva, Figma, Adobe Express, and browser-based utilities. Which tool fits which situation — based on real use, not just specs.
💻 Tech & Development
What Is JSON? A Plain-Language Explanation
JSON explained simply — what it is, how it is structured, and where it is used in the real world. Includes examples for APIs, config files, and data exchange.
What Is an IP Address? Public IP, Private IP, IPv4, and IPv6 Explained
A plain-language explanation of IP addresses: the difference between public and private IPs, IPv4 vs. IPv6, how to find your own IP, and what a VPN does to it.
How to Check Your IP Address — VPN, Remote Work, and Access Issues
Why you might need to check your IP address, and how to do it. Covers VPN verification, remote work network issues, diagnosing access blocks, and what your IP actually reveals.
When Non-Developers Need to Understand JSON — 5 Real Situations
JSON keeps showing up outside of development: e-commerce API integrations, ChatGPT automation, Google Analytics exports, Zapier and n8n flows. You don't need to write it — just know how to read it.
📊 Business & SNS
VAT Calculation Guide — How to Split Supply Price and Tax Correctly
A clear explanation of how VAT works in Korea: the relationship between supply price and total amount, the 10% rate, and common calculation mistakes to avoid.
Character Limits by Platform — Twitter, Instagram, SMS, and More
A complete reference of character limits for Twitter/X, Instagram, SMS, YouTube, and other major platforms. Includes notes on how Korean text differs from English in character counting.
🧠 Personality & Life
How Child Height Predictions Work — Measuring, Growth Charts and Parents' Heights
How to measure your child's height reliably at home, how to read growth chart percentiles, how the mid-parental height formula works, and what a home estimate cannot tell you.
MBTI 16 Types Guide — What Does Your Personality Type Mean?
An overview of all 16 MBTI personality types: what the E/I, S/N, T/F, and J/P dimensions mean, and the key traits, strengths, and tendencies of each type.
How to Get Better at Tetris + Its 35-Year History
Practical Tetris tips (T-spins, stacking strategies, clearing lines efficiently) alongside the fascinating story of how a Soviet programmer created the world's best-selling game in 1984.
Color Blindness — What You Probably Don't Know (8% of Men Are Affected)
What color blindness actually looks like, why so many people go undiagnosed, and what it means practically — for drivers, designers, and anyone who wants to make their work more accessible.