Guides
Plain-English explanations behind the tools: how things work, common mistakes, and practical tips you can use today.
6 min readHow Cron Schedules Really Work (and the Mistakes That Bite)A plain-English guide to the five cron fields, step values, the day-of-month trap and how to test a schedule before it goes live.6 min readSubnetting Made Simple: What the Slash Number Actually MeansUnderstand CIDR notation, subnet masks, usable hosts and how to size a network without memorising tables.6 min readLinux File Permissions Explained: Reading rwx and Octal Like a ProWhat 755, 644 and 600 really mean, how read, write and execute differ for files and folders, and which settings are safe.6 min readColour Contrast and WCAG: What the 4.5:1 Rule Really MeansHow contrast ratios are calculated, what AA and AAA require, and practical ways to fix low-contrast text without ruining your design.7 min readShould You Prepay Your Loan? How Extra Payments Cut InterestHow reducing-balance loans work, why early extra payments save so much, and how to decide between prepaying and investing.6 min readCounting Business Days Correctly: Weekends, Holidays and Edge CasesWhy working-day maths trips people up, how to treat the start and end dates, and what changes with Friday-Saturday weekends.5 min readHow to Compare Two Versions of a Text (and Actually Trust the Result)A practical guide to diffing documents and code: what line-by-line comparison shows, its limits, and tips for cleaner results.6 min readKeyword Density: Does It Still Matter for SEO?An honest look at keyword density, why there is no magic percentage, and how to use word-frequency analysis to improve your writing.6 min readUTM Tagging Best Practices for Clean AnalyticsHow to name sources, mediums and campaigns consistently so your Google Analytics reports stay readable, with examples and common mistakes.5 min readAspect Ratios Explained: Sizing Images and Video Without DistortionWhat aspect ratio means, how to calculate a missing dimension, and which ratios fit YouTube, Instagram, TikTok and print.6 min readScheduling Meetings Across Time Zones Without the HeadachePractical advice for finding fair meeting times across countries, handling daylight saving changes and avoiding common scheduling mistakes.