Trends, tips and insights from Click Star experts.
How to set Cache-Control for each content type, what a CDN changes, how to refresh caches and test with curl. Based on MDN, RFCs, and the Vercel and Cloudflare documentation.
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Each tool answers its own question: crawling, indexing or URL discovery. Based on Google Search Central documentation and RFC 9309.
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How to classify API keys, store secrets, grant least privilege, block leaks at push time, rotate keys and respond to a leak, based on OWASP, GitHub, Vercel, Next.js, Supabase, Stripe and Anthropic documentation and GitGuardian's report.
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What INP measures, the 200-millisecond threshold, how to measure it with field data and DevTools, and how to fix each of the 3 parts of an interaction, based on web.dev, Google and the 2025 Web Almanac.
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How to classify 429 and overload errors, retry with backoff and jitter, and use queues, batch APIs and fallback models when calling AI APIs. Based on Anthropic, OpenAI, RFC, AWS and Google SRE documents.
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The article explains when schema-constrained JSON output from Anthropic and OpenAI still fails to match, and how to re-check it on the server, based on current documentation read on October 23, 2026.
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This article explains CI/CD, preview deployments, protecting the main branch, environment variables, database changes and rollback, based on GitHub, Vercel and DORA documentation read on October 23, 2026.
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This article explains how 301, 302, 307 and 308 differ, whether canonical is a command or a hint, and in what order to move a website, based on Google Search Central, MDN and RFC 9110.
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How to design a contact form, validate data on the server and layer spam protection, based on MDN, web.dev, OWASP, W3C, Cloudflare Turnstile and Google reCAPTCHA.
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The article explains each UTM parameter, how GA4 sorts channels and Click Star's campaign naming framework, based on Google Analytics, Google Ads and Meta documentation.
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This article explains how to choose JPEG, PNG, WebP, AVIF or SVG, declare dimensions, use srcset, lazy loading and handle the LCP image, based on web.dev, MDN, Google Search Central and Click Star's own measurements on sample images.
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Which WCAG 2.2 level to aim for, the 7 groups of criteria to check first and a 30-minute manual review, based on W3C, MDN and WebAIM Million 2026.
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A content planning process built from real customer questions, based on Google's helpful content guidance, spam policies and E-E-A-T documents, with review and measurement steps.
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This article explains what Google Tag Manager contains, how web and server containers differ, who should get which permissions and how to control Custom HTML, speed and Consent Mode, based on Google's official documentation.
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How to read the Performance, Page indexing, Sitemaps and Core Web Vitals reports in Search Console and turn them into concrete tasks, based on Google's official help pages.
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The GA4 event model, key events, lead tracking, internal traffic filters, data retention and report limits, based on Google Analytics Help pages read on 22/10/2026.
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How to build a consented email list, segment it, set frequency and read the numbers when open rate is no longer reliable, based on Google, Yahoo and Apple documentation and Decree 91/2020/ND-CP via a copy.
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How to build a test question set from real customers, 6 scoring criteria, regression testing and 3 operating metrics, based on Anthropic, OpenAI and Google Cloud documentation.
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How to design a trustworthy A/B test for a landing page or email: hypothesis, sample size calculated in Python, run time and the early-peeking trap. Based on Optimizely, GrowthBook, Evan Miller and Mailchimp.
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ZNS is now ZBS Template Message tied to a Zalo OA. This article reads Zalo's official pages on conditions, templates, costs, API and rules, and flags where its price pages disagree.
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Explains what SPF, DKIM and DMARC do, From-domain alignment, the 10 DNS lookup limit and the Google and Yahoo bulk sender rules, based on the original RFCs and official help pages.
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This article covers what Google says about local ranking, which businesses qualify for a profile, how far review practices can go and which metrics to track, based on Google's official help pages.
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Explains JSON-LD, which schema types are still worth doing after Google ended FAQ and HowTo rich results, and how to write and test them, based on Google Search Central documentation read on October 22, 2026.
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How RFM is calculated and scored, with a tested PostgreSQL query, a 6-segment framework, its limits and how to measure with a control group. Based on Braze, Adobe, Klaviyo, PostgreSQL and the Fader, Hardie, Lee paper.
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