Jay Rajput

The exact YouTube thumbnail specs for 2026 — dimensions, file size limits, where they appear at different sizes, and the 7 design patterns that consistently get higher click-through rates.

What BMI, BMR and TDEE actually measure, when they're useful, when they mislead, and how to use them together with body-composition reality for honest health tracking in 2026.

A practical 2026 guide to color in web design — what HEX/RGB/HSL/OKLCH each do well, when to use which, building palettes that work across light and dark mode, and the contrast math that keeps you accessible.

What Base64 encoding actually does, the legitimate use cases (data URIs, JWT, email attachments, API tokens), the misuses (encryption substitute, password storage), and the URL-safe variant gotchas.

What hash functions actually do, why MD5 is dead for security but fine for checksums, when to use SHA-256 vs SHA-3 vs BLAKE3, and the password-hashing trap that catches every junior developer.

How exchange rates are set, why your bank charges 3-5% more than the rate Google shows, what the "mid-market rate" actually means, and how to actually save money on international transfers.

How QR codes actually work, the four error correction levels, the right size for scanning distance, when to use static vs dynamic, security risks (quishing), and 2026 design best practices.

When to write in Markdown, when HTML is necessary, when rich text editors are right, the conversion gotchas between formats, and the Markdown variants (CommonMark, GFM, MDX, MyST) you should know.

Real file-size and quality benchmarks for WebP, AVIF, JPEG XL, JPG and PNG in 2026. When to use which, browser support today, and the compression settings that hit the sweet spot.

Everything modern developers need to know about JSON: formatting standards, validation, the spec gotchas, JSON5/JSONC, schema validation, performance with large files, and the tools that actually help.

A working person's guide to regular expressions — the 12 patterns that solve 80% of real-world text problems, with copy-paste examples for email, phone, URL, dates, prices and more.

A 2026 guide to password length, entropy, modern cracking speeds, the death of complexity requirements, and how passphrases and password managers actually keep accounts safe.

Every meta tag that affects 2026 SEO and social sharing, what each character limit is, what Google actually uses, and how to test them before you ship.

Definitive 2026 word-count guide for blog posts, essays, emails, meta descriptions, social posts, ad copy, novels and more — with the research behind every number and the tools to measure yours.

Compress PDFs by 50-90% without visible quality loss. Eight methods compared with real file-size tests, when to use each, and why most "PDF compressors" actually destroy your file.