Vercel

Deploying to Vercel is pretty much straightforward similar to Netlify. You can start with a New Vercel app. In that page, import your repository from git, Click next

in the next page, Create a team first

then in Configure Project section, select Framework preset as Create React App and then add any extra build settings you want to add. Make sure to add the environment variables for the app below that. For more details See Environment Variables

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Note:

You can change the environment variables any time later in the settings page of your project dashboard. Every time you change a variable, add/remove a variable, you have to rebuild and make a new deployment for the environment variables to take effect. This is a mandatory step and must be done.

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Now click deploy. Wait for the project to be deployed. Once it's successful, you should see a screen like this

Click Go to dashboard

in the dashboard page, you should be able to see the app by clicking "Visit" button on the deployment screen. Click it to see your app in action.

That's it. You are all done.