https://guang84.github.io/articles/Guang’s personal profile and public knowledge hub for complete projects with embedded guides, technical articles, research notes and documented experiments across technology, cybersecurity, AI, networking, sustainability and engineering.https://guang84.github.io/articles/?id=buying-laptop-2026-specs-guidehttps://guang84.github.io/articles/?id=buying-laptop-2026-specs-guideA Core Ultra 7 or Ryzen 7 badge does not tell you how fast a laptop really is. Processor generation and suffix, GPU power limits, VRAM, RAM type and channel configuration, SSD technology, cooling, display quality, battery capacity, and upgradeability can matter just as much as the headline CPU name.Thu, 10 Sep 2026 00:00:00 +0000https://guang84.github.io/articles/?id=right-sized-aihttps://guang84.github.io/articles/?id=right-sized-aiA decision framework for using AI where it creates real value, choosing the lightest capable system, and keeping people accountable for the result.Sun, 06 Sep 2026 00:00:00 +0000https://guang84.github.io/articles/?id=repair-before-replacehttps://guang84.github.io/articles/?id=repair-before-replaceA practical path for keeping electronics useful longer, protecting personal data, and sending truly finished devices into responsible reuse or recycling.Sun, 06 Sep 2026 00:00:00 +0000https://guang84.github.io/articles/?id=passkeys-and-the-human-side-of-securityhttps://guang84.github.io/articles/?id=passkeys-and-the-human-side-of-securityA practical guide to phishing-resistant sign-in, safer account recovery, and the human habits that still matter after passwords begin to disappear.Sun, 06 Sep 2026 00:00:00 +0000https://guang84.github.io/articles/?id=better-light-better-nighthttps://guang84.github.io/articles/?id=better-light-better-nightHow careful placement, shielding, warm colour, dimming, and simple controls can make outdoor lighting more useful to people and less disruptive to wildlife.Sun, 06 Sep 2026 00:00:00 +0000https://guang84.github.io/articles/?id=soil-sensors-need-ground-truthhttps://guang84.github.io/articles/?id=soil-sensors-need-ground-truthHow growers can combine moisture sensors, field observation, weather, and simple records to irrigate with more confidence and less false precision.Sun, 06 Sep 2026 00:00:00 +0000https://guang84.github.io/articles/?id=learning-from-soilhttps://guang84.github.io/articles/?id=learning-from-soilField notes on calibration, false precision, and why a farmer’s hand can be the best instrument in the loop.Tue, 18 Aug 2026 00:00:00 +0000https://guang84.github.io/articles/?id=responsible-aihttps://guang84.github.io/articles/?id=responsible-aiA practical framework for deciding whether an AI system should exist, what it should optimize, and who gets to question it.Sat, 11 Jul 2026 00:00:00 +0000https://guang84.github.io/articles/?id=security-is-carehttps://guang84.github.io/articles/?id=security-is-careMoving beyond fear-driven security toward systems that respect attention, dignity, and ordinary human behavior.Wed, 22 Apr 2026 00:00:00 +0000