Developer Guides
Practical references for tools developers use every day — Linux permissions, networking, authentication, and more.
Unix Timestamps and Time Zones: A Developer's Reference
Everything you need to know about Unix timestamps, UTC vs local time, ISO 8601 format, daylight saving pitfalls, and how to work with dates correctly in JavaScript, Python, and Go.
Markdown Guide for Developers: Tables, Code Blocks, and More
A complete Markdown reference for developers covering tables, code blocks with syntax highlighting, task lists, footnotes, GitHub-Flavored Markdown, and Mermaid diagrams.
Password Security: Entropy, Strength, and Best Practices
Understand password entropy and why length beats complexity. Learn the difference between random and memorable passwords, how password managers work, and current NIST guidelines.
JSON Formatting and Validation: A Developer's Guide
Learn JSON syntax rules, common parsing errors, formatting best practices, JSON Schema validation, JSONPath queries, and tools for working with JSON in APIs, configs, and data pipelines.
Essential Git Commands Every Developer Should Know
A practical Git reference covering branching, stashing, rebasing, undoing mistakes, and advanced commands like bisect, reflog, and worktrees. With real-world workflows and examples.
UUIDs Explained: v1 vs v4 vs v7 and When to Use Each
Understand UUID versions — v1 (time + MAC), v4 (random), v5 (name + hash), and the new v7 (sortable). When to use each, database implications, and alternatives like NanoID and ULID.
Base64 Encoding Explained: What It Is, When to Use It
Understand how Base64 encoding works, the difference between Base64 and Base64URL, when to encode vs encrypt, and practical use cases in web development, APIs, and data transfer.
Regex for Developers: Practical Patterns You'll Actually Use
A practical regex guide covering anchors, quantifiers, groups, lookaheads, and 20+ real-world patterns for emails, URLs, dates, IDs, and more. Includes JavaScript, Python, and Go examples.
JWT Tokens Explained: Structure, Signing, and Security
Learn how JSON Web Tokens (JWT) work, how to decode and verify them, common vulnerabilities like the 'alg:none' attack, and best practices for using JWTs securely in your applications.
CIDR Notation & Subnetting: A Practical Guide for Developers
Understand CIDR notation, subnet masks, and IP ranges. Learn how /24, /16, /8 networks work, when to use private ranges, and how to subnet for cloud and on-prem infrastructure.
chmod Explained: Linux File Permissions for Developers
Master Linux file permissions with chmod. Understand octal notation, symbolic mode, chmod 755 vs 777 vs 644, and real-world examples for web servers and scripts.