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Practical guides covering developer tools, health metrics, SEO, converters and more — written to be actually useful.
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The 300-Year Unbreakable Cipher That Got Broken — Vigenère, Enigma, and What Every "Unbreakable" Cipher Has in Common
RD Goal Calculator — Find the Exact Monthly Deposit for Any Savings Goal
Learn how to work backwards from any savings target to a specific monthly deposit, plan multiple goals simultaneously, and adjust timelines when the monthly amount exceeds budget — with a free RD goal calculator.
Loan Planner — Master Your Amortisation Schedule & Prepayment Strategy
Learn how to read an amortisation schedule, find the crossover point where principal beats interest, why prepayment timing matters, and how to use a free loan planner to take control of any loan.
EMI Calculator — How to Reduce Your Total Loan Cost with 3 Levers
Learn how EMI is structured, why early prepayment saves the most, and how to use the three levers — principal, rate, and tenure — to reduce your total loan cost, with a free EMI calculator.
HTTP Caching Deep Dive: Cache-Control Directives, ETags, and Content Hashing Strategy
Content-hashed filenames with max-age=31536000 can eliminate network requests for returning users. Here's the complete HTTP caching strategy: Cache-Control directives in depth, ETags and conditional requests, the Vary header pitfall, CDN cache busting, and a practical caching strategy by resource type.
Regex for Data Cleaning: Practical Patterns for Messy Real-World Data
Real-world data — phone numbers, dates, emails, log entries, product codes — arrives inconsistently. Here are the regex patterns for the most common data cleaning tasks: phone normalisation, date standardisation, HTML stripping, whitespace cleaning, and log redaction.
Fuzzy Deduplication and Record Linkage: When Exact Matching Isn't Enough
Exact deduplication handles perfect matches — but real data has name variations, address inconsistencies, and multi-source formatting differences. Here's fuzzy matching, the record linkage workflow, edit distance, Soundex, and SQL and Python approaches for production-quality deduplication.
Content Truncation Rules: How Every Platform Cuts Your Text — and How to Write for It
Every platform truncates differently — email subject lines at 50 characters, push notifications at 80, meta descriptions at 155. Here's the truncation rules for major platforms, how to implement word-boundary truncation in code, and using truncation as a deliberate writing technique.
Simple Interest Calculator — Understand Flat-Rate Loans and Their True Cost
Learn how simple interest differs from compound interest, where it's still used in modern finance, why flat-rate loans cost far more than their headline rate suggests, and how to use a free simple interest calculator.
How Gmail Decides Where Your Email Lands: Inbox, Promotions, and Spam Explained
Gmail routes email based primarily on engagement signals — opens, clicks, spam complaints, and whether recipients move messages to Primary. Here's how the three-tier system works, what signals determine Promotions vs. Primary, why list segmentation improves deliverability, and how Outlook differs from Gmail.
HTTP Status Codes Explained: A Complete Debugging Guide for API Work
HTTP status codes have precise meanings that most developers only half-know. Here's the complete guide — every important 2xx, 3xx, 4xx, and 5xx code explained with debugging guidance for each.
Using Heading Extraction for Competitive Content Research and Brief Building
Heading extraction is more valuable as a competitive research tool than for auditing your own pages. Here's how to build a content brief from competitor heading patterns, identify coverage gaps, and structure headings for featured snippet opportunities.
Stress Testing with Repetitive Data: The Edge Cases That Break Real Systems
Normal test data misses the edge cases that break real systems. Here's how repetitive and generated data exposes UI text overflow bugs, database cardinality issues, ReDoS vulnerabilities, and the principles behind fuzz testing and property-based testing.
