The web.dev wiki covers details about the site and how it's operated/deployed. If you're looking for content guidance, please check out https://web.dev/handbook.

1. Builds
   • CSP
2. Staging
3. Deploying the site
4. Localization
5. Pullapprove
6. Netlify
7. Imgix
8. Algolia
9. Percy
10. Stalebot
11. chrome-devrel-review-bot
12. content proposal form
13. Codepen
14. Glitch
15. Analytics

There are some Google-internal notes at go/web.dev, under Engineering.