Google Tag Manager is a tag management system (TMS) that allows you to quickly and easily update measurement codes and related code fragments collectively known as tags on your website or mobile app.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
Open Graph is a protocol that is used to integrate any web page into the social graph.
Sanity is a platform for structured content. It comes with an open-source, headless CMS that can be customized with Javascript, a real-time hosted data store and an asset delivery pipeline.
Vercel is a cloud platform for static frontends and serverless functions.