Knowledge Base

Base64 appears in APIs, JWTs, emails, and data URLs, but it is not encryption. This practical guide explains the mechanics, trade-offs, and real-world usage patterns you should know.

Markdown is the go-to lightweight markup language for writers, developers, and content creators. This guide covers everything from core syntax to advanced techniques and platform-specific applications.

RGB, HEX, and HSL all describe the same colors — but in completely different ways. This guide breaks down the math, the design logic, and when to use each color model, from screen design to print and accessibility.

What engineering hides inside those black-and-white squares? Is scanning always safe? This guide covers QR Code structure, error correction, data types, creation best practices, and the security risks you should know.

Passwords are your first line of defense. This guide helps you build a practical and sustainable strategy.

JSON is the common language of modern web services. This guide covers syntax, data modeling, validation, security, and performance patterns for production-ready JSON workflows.

Regular Expression (Regex) is the most powerful text processing tool in modern programming. This comprehensive guide covers symbol meanings, common patterns, advanced techniques, and practical applications to help you master regex for data validation, extraction, and replacement.

Emoji are not just decoration. They shape tone, reduce ambiguity, and influence engagement. Learn practical rules for professional use, brand consistency, and cross-platform reliability.

From supermarket checkout to shipping labels and ISBN codes, one-dimensional barcodes still power a huge share of physical commerce. This guide explains how 1D barcodes encode data, how scanners read them, and what matters when generating or printing them.