How ti send data from Ionic App to a database like Firebase

Hi Everyone,
I am a beginner to Ionic-Angular.
I am looking for a way to connect my app to a database so that when user inputs data lets say in a form, I would like to store that data in a firebase database. I would appreciate any kind of suggestions.

Read the docs, they have example: Fügen Sie Daten zu Cloud Firestore hinzu  |  Firebase