Guides & Tutorials
Image Optimization for Web: Formats, Compression, and Performance
A practical guide to making images load fast without looking terrible — format selection, compression quality settings, responsive images, and the mistakes that tank your Core Web Vitals.
Calorie Counting Explained: TDEE, Macros, and What the Numbers Mean
The honest truth about calorie counting — how BMR and TDEE are calculated, why the numbers are estimates not prescriptions, and when a calculator helps vs when you need a professional.
Markdown Syntax Guide: The Complete Reference for 2026
Everything you need to write Markdown fluently — from basic formatting to GitHub Flavored Markdown extensions, with real examples and the compatibility pitfalls that trip people up.
Timezone Handling in Software: DST, Offsets, and Common Bugs
Timezones are harder than you think — DST creates impossible times, offsets change without warning, and every scheduling system has timezone bugs. Here is how to handle them correctly.
Base64 vs Hex Encoding: Data Formats Compared
A practical comparison of Base64, hex, URL-encoding, and raw binary — size overhead, readability, compatibility, and clear recommendations for when to use each format.
How to Read Amortization Schedule: A Clear Guide
A plain-English guide to reading amortization schedules — what each column means, why the interest-to-principal ratio shifts over time, and how to use the table to save money.
Floating Point Precision Errors: Why 0.1 + 0.2 ≠ 0.3
Why every programming language gets 0.1 + 0.2 wrong, how IEEE 754 floating point actually represents numbers, and what to do about it in financial calculations and scientific code.
Unit Conversion Errors: Why Mars Orbiter Crashed
The $327 million Mars Climate Orbiter crashed because of a unit conversion error. Here are the real stories, the patterns behind these failures, and how to prevent them.
Is BMI Accurate? What Your Number Actually Means
The honest truth about BMI — a 200-year-old formula that ignores muscle, bone density, and fat distribution. What it can tell you, what it can't, and what to use instead.
Compound Interest Formula: The Math of Growing Money
How compound interest actually works — the formula, worked examples with real numbers, the Rule of 72, and honest talk about when compound growth assumptions break down.
Hex vs RGB vs HSL: Color Formats for Developers
A developer-focused guide to color formats — when to use hex, RGB, or HSL, how to manipulate colors programmatically, and the accessibility math behind contrast ratios.
Unix Timestamp Converter: Epochs, Timezones, 2038
How Unix timestamps work, why timezone bugs are so common, what happens in 2038, and practical patterns for storing and converting time in your applications.
QR Code Size Requirements and Best Practices
Practical QR code guidelines — minimum print sizes, how error correction works, maximum data capacity, and the design mistakes that make your codes fail in the real world.
MD5 vs SHA256: Hash Functions Explained Simply
What hash functions actually do, why MD5 is dead for security but fine for checksums, and a practical guide to choosing between SHA-256, SHA-3, BLAKE3, and bcrypt.
UUID vs ULID vs Snowflake: Picking the Right ID
A practical comparison of UUID, ULID, and Snowflake IDs — with database index performance numbers, sorting behavior, and clear recommendations for different use cases.
Mortgage Payment Formula: How Your Monthly Bill Works
A no-nonsense breakdown of how mortgage math works — the actual formula, a worked example with real numbers, and why your first payment is almost all interest.
Password Security Best Practices in 2026
What actually makes a password strong in 2026 — based on NIST 800-63B, real breach analysis, and how modern cracking hardware works. Spoiler: "P@ssw0rd1!" is terrible.
URL Encoding Guide: Percent-Encoding Rules Explained
Why URLs break when you paste special characters, how percent-encoding actually works, and the difference between encodeURI and encodeURIComponent that trips up every developer at least once.
Regex Cheat Sheet: Patterns Every Developer Needs
The regex patterns you actually use at work — email validation, URL parsing, password rules, log extraction — with explanations of why they work and where they break.
Base64 Encoding Explained: When, Why, and How
A practical breakdown of Base64 — the encoding scheme that turns binary into text. Covers the algorithm, real use cases, performance costs, and mistakes to avoid.
Complete Guide to JSON: Syntax, Validation & Common Errors
Everything you need to know about JSON — from basic syntax to fixing the errors that trip up even experienced developers.