Practical guides
Work through web, advertising, business and AI questions with clear examples, useful checks and primary references.
Web & development
HTTP 429 Too Many Requests: Retry-After and a safe retry plan
Diagnose HTTP 429, read Retry-After correctly and design a bounded retry queue with backoff, jitter and a worked request-rate example.
Read the guide Web & developmentResponsive images: srcset, sizes and device pixel ratio explained
Choose responsive image candidates with a worked CSS slot and DPR example, valid srcset markup and a practical browser inspection checklist.
Read the guide Web & developmentJavaScript and CSS cache busting: filenames, versions and safe releases
Fix stale JavaScript and CSS with content-versioned URLs, an HTML caching policy and a release checklist that also supports older open pages.
Read the guideAdvertising & measurement
Ad clicks vs analytics sessions: explain a traffic discrepancy
Reconcile ad clicks, landing requests and GA4 sessions with a worked measurement funnel and a checklist for redirects, consent and reporting scope.
Read the guide Advertising & measurementUTM parameters: a naming plan and campaign tracking checklist
Build consistent UTM campaign links, preserve existing URL parameters and fragments, and check attribution without putting personal data into URLs.
Read the guide Advertising & measurementGA4 bounce rate vs engagement rate: definitions and worked examples
Calculate GA4 engagement and bounce rates from the same sessions, understand the engaged-session conditions and audit misleading comparisons.
Read the guideBusiness arithmetic
AI planning
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