If you already have an application then you can skip these and go to installing Firebase.
To make some steps easier let's pick a name for our new application which we will save as an environment variable to reuse.
export REACT_APP=hello-firebase; # replace with your application's name
Use npx and create-react-app to boilerplate a new react application. I recommend using Typescript to enable type-checking
npx create-react-app ${REACT_APP} --typescript
Wait a little bit while create-react-app gets ready. When finished enter the application directory:
In order to work with firebase you will need the firebase command line tool. The easiest way to get it is to install globally with npm: