Zeit has great documentation, but it took me a while to understand the difference between environment variables (secrets) on the serverless side vs how to get env vars exposed and available to the React code which runs client side, in the browser.
Let's deploy a Next.js app to Vercel! This app contains two types of Env variables... one we want to include in the public build of our app, and another we only want available during "runtime", which means in this case when the serverless api functions are executed... these env variables in runtime are secret!
How simple can it be to create a website, get a custom domain, build a serverless API, configure automatic deployments, and take the whole thing live? With ZEIT’s suite of tools, it can be pretty dang simple.