Inside look at modern web browser (https://developer.chrome.com/blog/inside-browser-part1/) - fun illustrations
Nunjucks (https://mozilla.github.io/nunjucks/templating.html) - easy-to-use site nav
Vodafone + Core Web Vitals case study (https://web.dev/vodafone/) - packed with info and no marketing BS (disclosure: I was majorly involved in that content)