Technology Guides

Understand what an SSL certificate check, a DNS lookup, and a WHOIS lookup each actually tell you about a website, and how to use them together.

Learn the core building blocks of regular expressions — literals, character classes, quantifiers, and anchors — and where they are genuinely useful.

Understand what a hash function does, why MD5 is no longer considered secure, and when SHA-256 or SHA-512 is the right choice instead.

Learn what a JSON Web Token actually contains, the critical difference between decoding and verifying one, and why token expiry matters for security.

Understand what a sitemap, a robots.txt file, and meta tags actually do for search visibility — and a common mistake that contradicts itself.

A plain-English explanation of what a UUID is, why it’s practically guaranteed to be unique, and where it’s commonly used.

Understand how QR codes work, what they can and can’t do, and practical safety habits before scanning one.

Understand what JSON is, its basic structure and syntax rules, and why properly formatted JSON matters.