Blog

• Understanding JSON: A Practical Guide - What JSON is, the strict rules that trip people up, how to read a parser error, and the traps with dates, big numbers and comments, with worked examples.
• MD5 vs SHA-256: Understanding Hash Functions - What a hash function does, why MD5 is broken for security but still fine for checksums, what SHA-256 is used for, and why neither should store passwords.
• How to Create a Genuinely Strong Password - Why length beats complexity, how passphrases and generated passwords compare in real numbers, what current guidance recommends, and why a unique password for every site matters most.
• Two-Factor Authentication Explained - How two-factor authentication works, how SMS codes, authenticator apps, push prompts and security keys compare, and how to set it up without locking yourself out.
• How Loan Amortization Actually Works - Why early loan payments are mostly interest, the formula behind every fixed monthly payment, and worked examples showing what extra payments and shorter terms really save.
• BMI Explained: What It Measures and What It Doesn't - How body mass index is calculated in metric and imperial units, what the standard ranges mean, why BMI misjudges some people, and what to look at alongside it.
• What Is a UUID, and Why Does It Matter? - How UUIDs are structured, the differences between versions 1, 4 and 7, how unlikely a collision really is, and when to use them as database keys.
• Regular Expressions 101: A Practical Introduction - The regex building blocks you'll actually use - character classes, quantifiers, anchors, groups and flags - with worked patterns, greedy vs lazy matching, and the mistakes that cause bugs.
• Base64 Encoding Explained (It's Not Encryption) - How Base64 turns bytes into text, why it makes data a third larger, where you'll see it (email, data URLs, JWTs, Basic auth), and why it offers no security at all.
• AES-256 Encryption: What It Is and How to Use It - What AES-256 is, why its key is effectively unbreakable, why the mode of operation and the passphrase matter more than the algorithm, and where you already use it every day.
• PDF Merging and Splitting: When and Why You'd Need Either - Common reasons to combine or split PDFs, how page ranges work, what can get lost along the way (bookmarks, forms, links), and how to keep file sizes and private documents under control.
• What Is DNS, and How Does It Actually Work? - How DNS turns names like example.com into addresses, step by step through resolvers, root, TLD and authoritative servers, plus record types, caching, "propagation" and how to troubleshoot.
• Image Compression Explained: Lossy vs. Lossless - How JPEG, PNG, WebP and AVIF shrink images, when each format is the right choice, why resizing matters more than quality settings, and how to avoid blurry or bloated images.
• How Large Language Models Actually Generate Text - What tokens are, how a language model predicts text one piece at a time, why the same question can get different answers, why models sometimes state false things confidently, and how to use them well.
• Why Random Number Generators Aren't Always Random - The difference between pseudo-random, cryptographically secure and true random numbers, how a small bug called modulo bias skews results, and why real randomness looks less random than people expect.
• How QR Codes Actually Work (and How They Fail) - How QR codes store data, how error correction lets damaged codes still scan, why some codes won't scan, how to make reliable ones, and how to avoid QR scams.
• Why Currency Exchange Rates Change Every Second - What moves exchange rates, what the mid-market rate is, how banks and card providers add hidden markups, and practical ways to pay less when spending or sending money abroad.
• The Real Psychology Behind Habit Streaks - What research says about how long habits take to form, why streaks motivate and why breaking one can make people quit, and how to track habits so it helps rather than backfires.