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The only requirement that you should meet before starting this tutorial is to have Flutter installed, and to have a minimal idea of how it works. You don't need to know anything about Firebase. For those who learn better by looking at code, here you can find all the source code for this tutorial.
For those of you who don't know what Firebase is: Firebase is a Backend-as-a-Service provider. It gives a variety of tools and cloud services to develop and grow apps. In this specific tutorial, we are going to use Cloud Firestore to store the feedback data that the users are going to submit.
Flutter Fire is the name given to the plugins that integrate Firebase within a Flutter app. There are basically two ways to integrate Firebase into a Flutter app: integration via configuration files, which is done in the native parts of the app, or a newer automated and faster mechanism that was created recently. In this tutorial we are going to use the latter, to do so you have at your disposal an exhaustive explanation in the official documentation, where basically they ask you to install Firebase CLI on your system, and then enable FlutterFire CLI.