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There are a variety of options available for storing data, and choosing the right one will depend on your application needs, your expertise, and resources.
Firebase offers Cloud Firestore which is a flexible, scalable NoSQL cloud database that is very easy to use with an Ionic app.
The following tutorials explain all the steps needed in order to set up a Firestore database and connect it with your Ionic Framework application.
If you are looking for a Ionic Starter App with Firestore integration ready to go, you should check Ionic Full Starter App - PRO. It includes many examples and use cases of Data Storage using Ionic and Firestore such as a complete CRUD.