HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
JSDelivr is a free public CDN for open-source projects. It can serve web files directly from the npm registry and GitHub repositories without any configuration.
Stitches is a is a CSS-in-JS styling framework with near-zero runtime, SSR, and multi-variant support.
Twitter is a 'microblogging' system that allows you to send and receive short posts called tweets.
Vercel is a cloud platform for static frontends and serverless functions.