TL;DR

Click this:

and click yes to everything!

Is that it?

Yeah pretty much. This process creates a fork of https://github.com/netlify-labs/deploy-create-react-app (simply a site that has the output of npx create-react-app deploy-create-react-app) that you can then clone locally and edit. When you're done and git push origin master, your changes will be automatically redeployed.

What do I get?

• SSL out of the box
• Free Custom Domains (you can buy a domain there or use one bought elsewhere)
• Continuous Deployment
• Redirects useful for Single-Page-Apps!

And many more features

Other ways to deploy

These Deploy Buttons are merely one way to deploy to Netlify.

• If you have an existing repo on GitHub/GitLab/BitBucket you can simply create a new site from that repo.
• If you have a local project you can use the Netlify CLI and run netlify init to initialize a site.
• If you don't want to use Netlify's buildbot and continuous deploy you can run your own build and directly deploy a folder to production with netlify deploy --prod

Why?

This tutorial was made in response to this Reddit thread.