Blog
CSS Flexbox: The Complete Visual Guide
Master Flexbox layout — align, justify, wrap, grow, shrink, and order with visual examples for every property.
Core Web Vitals: LCP, INP, CLS Explained
Understand Google's Core Web Vitals — what LCP, INP, and CLS measure, good scores, and how to improve each one.
DNS Records Explained: A, CNAME, MX, TXT, and More
Understand DNS records — what each type does, when to use them, and how to debug DNS issues.
npm vs yarn vs pnpm: Which Package Manager in 2026?
Compare npm, yarn, and pnpm — speed, disk usage, monorepo support, and which one to pick for your project.
TypeScript Utility Types: The Practical Cheatsheet
Master Partial, Pick, Omit, Record, Required, and more — with real use cases, not just definitions.
SSH Keys: Generate, Configure, and Manage Like a Pro
Set up SSH keys for GitHub, servers, and multiple accounts — Ed25519, ssh-agent, and the config file.
REST API Design: Naming, Pagination, Errors, and Versioning
Design APIs that developers actually enjoy using — resource naming, pagination patterns, error formats, and versioning strategies.
CORS Explained: Why Your API Call Is Blocked
Understand CORS errors once and for all — what the browser is doing, why preflight requests exist, and how to fix it.
How to Format JSON: Complete Guide
Learn the best practices for formatting, validating, and minifying JSON data in your daily workflow.
SQL Formatting Best Practices for Readable Queries
Write clean, maintainable SQL with proper formatting conventions that your whole team can follow.
Git Branching Strategies: Gitflow vs Trunk-Based vs GitHub Flow
Choose the right branching strategy for your team — comparing Gitflow, trunk-based development, and GitHub Flow.
TOTP: How Two-Factor Authentication Actually Works
The math behind those 6-digit codes from Google Authenticator — HMAC, time steps, and implementing TOTP from scratch.
JSON to CSV: Convert Data for Spreadsheets
Export API data to CSV format for Excel, Google Sheets, or data analysis tools.
Open Graph Meta Tags: Control How Your Links Look on Social Media
Set og:title, og:image, og:description and Twitter Cards to make your links stand out when shared.
UUID v4: Why and How to Generate Unique IDs
Understanding UUID generation, collision probability, and when to use them in your systems.
Zodiac Signs Calculator: Find Your Sign by Birth Date
Find your zodiac sign instantly by entering your birth date. Learn about all 12 signs, their date ranges, and characteristics.
Docker Commands: The Complete Cheatsheet
Every Docker command you need, organized by category — from containers to compose to system cleanup.
Dockerfile Best Practices: Smaller, Faster Builds
Write production-ready Dockerfiles — multi-stage builds, layer caching, security hardening, and image size optimization.
bcrypt: The Best Way to Hash Passwords
Why bcrypt remains the gold standard for password hashing, and how to implement it correctly.
Markdown Syntax: The Complete Cheatsheet
Every Markdown feature in one place — headings, links, images, tables, code blocks, and GitHub-flavored extras.
Environment Variables: The Developer's Guide
Manage configuration properly — .env files, process.env, secrets in CI/CD, and the 12-factor app approach.
Color Contrast: WCAG Accessibility Guide
Check if your color combinations meet WCAG accessibility standards — and why it matters more than you think.
Password Generator: How to Create Truly Strong Passwords
The math behind password strength, why length beats complexity, and how to generate secure passwords.
HTTP Status Codes: The Complete Reference
Every HTTP status code explained — when to use 200 vs 201, why 404 isn't always a mistake, and what 503 means for your users.
Brazil's Minimum Wage: History, Values, and Calculator
Track Brazil's minimum wage history from 1940 to 2026. Calculate purchasing power changes and understand the annual adjustment policy.
Regex Patterns: The Ultimate Reference
Common regex patterns with explanations, from email validation to password rules to URL parsing.
.gitignore Patterns: What to Exclude from Your Repository
Write effective .gitignore files — patterns, common templates, and the files you should never commit.
URL Encoding: Why %20 Appears in Your URLs
Understand URL encoding — which characters need escaping, why browsers do it, and how to encode/decode properly.
Cron Expressions: Schedule Tasks Like a Pro
Master cron syntax for automated task scheduling — from basics to advanced patterns.
Base64 Encoding: What It Is and How to Use It
Everything you need to know about Base64 — encoding, decoding, data URIs, and when NOT to use it.
SHA-256 Hashing: How It Works and When to Use It
Understand SHA-256 hashing — how it produces fixed-length digests, why it's irreversible, and where it's used in real systems.
Spinner Wheel: Make Random Decisions the Fun Way
Create custom spinner wheels for random selection. Perfect for classrooms, team decisions, giveaways, and breaking deadlocks.
CSS Minification: A Performance Quick Win
Compress your CSS files for faster page loads — what gets removed, how much you save, and when it matters.
JWT Tokens: Decode and Understand Your Tokens
Inspect JWT tokens to debug authentication issues — understand the header, payload, and signature.
Linux Terminal: 50 Essential Commands
The most used Linux commands for developers and sysadmins — organized by category with real examples.
First Million Calculator: How Long to Reach Your Goal?
Find out how long it takes to save your first million with different investment strategies. Realistic scenarios with compound interest.
CPF and CNPJ Generator: Valid Numbers for Testing
Generate valid CPF and CNPJ numbers for software testing. Understand the validation algorithm and why test data matters.
Savings Simulator: The Power of Compound Interest
Simulate your savings growth with compound interest. See how regular contributions and time can build wealth.
Fraction Calculator: Add, Subtract, Multiply, and Divide Fractions
Master fraction arithmetic with step-by-step explanations. Calculate with fractions, mixed numbers, and simplify results instantly.
List Sorter: Organize Text Lists Alphabetically or Numerically
Sort any text list alphabetically, numerically, or in reverse order. Remove duplicates and clean up messy lists instantly.
Rule of Three Calculator: Solve Proportions Instantly
Learn how to use the rule of three to solve proportions in everyday life, cooking, finance, and programming.
WhatsApp Link Generator: Create Click-to-Chat Links
Generate WhatsApp click-to-chat links for your business. Let customers message you directly without saving your number first.
Receipt Generator: Create Professional Receipts Online
Generate professional receipts for payments, services, and freelance work. No software needed, create and download instantly.
Online Notepad: Quick Notes Right in Your Browser
Take quick notes without any app installation. Your browser becomes a lightweight, distraction-free notepad with auto-save.
Lottery Number Generator: Get Random Picks Instantly
Generate random lottery numbers for Mega-Sena, Powerball, EuroMillions, and more. Learn how lottery probability works.
CSR Decoder: Understanding SSL Certificate Signing Requests
Decode and verify CSR (Certificate Signing Request) files. Learn what's inside a CSR and how SSL certificate issuance works.
Dice Roller: Generate Random Numbers for Tabletop Games
Roll virtual dice for D&D, board games, and more. Learn about dice notation, probability, and how random number generation works.
Random Number Generator: Ranges, Distributions, and Use Cases
Generate random numbers with custom ranges and learn about true vs pseudo randomness, distributions, and cryptographic security.
Internet Speed Test: How to Check Your Connection Speed
Test your internet speed and understand what download, upload, and ping numbers actually mean for your daily use.
Keyboard Shortcuts Every Developer Should Know
Master keyboard shortcuts for VS Code, browser DevTools, terminal, and OS. Boost your development speed dramatically.