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Why API Key Rotation Is Harder Than It Should Be — Zero-Downtime Rotation, Secure Distribution, and the Permanent Git History Problem
Email Deliverability Beyond Authentication: Reputation, Engagement, and IP Warming
SPF, DKIM, and DMARC prove you're legitimate — but engagement rates, complaint rates, list hygiene, and domain age determine whether you land in inbox or spam. Here's the deliverability signals major providers actually use, IP warming schedules, and the 2024 Google/Yahoo requirements in practice.
CAN-SPAM vs GDPR vs CASL: Email Marketing Compliance for International Senders
CAN-SPAM, GDPR, and CASL have different models (opt-out vs opt-in) and very different penalties. Here's what each requires, how they differ in a practical comparison matrix, and the compliance approach for organisations sending internationally to all three jurisdictions.
TLS Configuration Beyond Certificates: Versions, Cipher Suites, HSTS, and OCSP Stapling
TLS 1.0 and 1.1 are still enabled on more servers than they should be. Here's TLS version history and current status, what cipher suites determine (including forward secrecy), HSTS preloading requirements, OCSP stapling, and how to use SSL Labs to grade your TLS configuration.
URL Design: Why Your Slug Is a Commitment — and How to Get It Right
A URL published today may need to work in 2034. Here's how Wikipedia, the BBC, and GOV.UK approach URL permanence and readability, the SEO costs of changing slugs, and the slug design principles that produce URLs worth keeping.
How Much Internet Speed Do You Actually Need? What Streaming, Video Calls, and Remote Work Require
Gigabit broadband is overkill for most households — a family of four watching 4K and video calling needs about 150 Mbps download. Here's what different activities actually require, why upload speed matters more for remote work than download, and how to run a speed test that reveals actual performance.
Area Converter — Kathas, Bighas, Decimals & Bangladesh Property Units Explained
Learn Bangladesh's land measurement system (kathas, bighas, decimals), the complete conversion relationships with metric and imperial units, and how to compare property prices accurately with a free area converter.
Time Zone Converter — Convert Any Time Between World Timezones Instantly
Learn how time zones work, why Daylight Saving Time causes scheduling surprises, how to find convenient overlap for remote teams, and how to use a free time zone converter for meetings, logs, and travel planning.
XSS and HTML Encoding: The Five Contexts That Require Different Escaping
XSS is still the most common web vulnerability — and unescaped HTML is the mechanism. Here's how cross-site scripting actually works, the five encoding contexts that require different treatment, why React is safe by default but PHP isn't, and how CSP adds a second layer.
The Ideal Weight Formulas Were Designed for Drug Dosing — Not Your Health Goals
The ideal body weight formulas in most calculators were developed in the 1960s–70s for drug dosing — not for health or fitness goals. Here's what they actually measure, why they disagree, and what a more useful framework looks like.
Troy Ounces, Gold Pricing, and Why Precious Metals Use a Different Weight System
A troy ounce (31.1g) is 9.7% heavier than an everyday ounce (28.35g) — and all precious metal pricing uses the troy system. Here's how gold prices work per gram and per tola, the three weight systems compared, and why karat means two completely different things.
Cloud VPC Design: Public vs Private Subnets, NAT Gateways, and the Three-Tier Architecture
AWS VPCs, GCP VPCs, and Azure VNets follow the same three-tier pattern — public subnets for internet-facing resources, private subnets for application and data tiers. Here's the terminology across providers, NAT Gateway mechanics, VPC peering, and the four most common cloud network design mistakes.
Retirement Calculator — Find Your Actual Corpus Target Before It's Too Late
Learn why most retirement estimates are too low, how inflation and longevity compound the planning challenge, the key variables that determine your target corpus, and how a free retirement calculator gives you a defensible number.
