Saving Data on Android

What is Cloud Firestore?
Cloud Firestore
 is a NoSQL database similar to the Realtime Database. It stores data 
in a structure that looks like a tree, but where data is stored as documents.
Documents
 and 
collections
 are the primary building blocks of the Cloud Firestore. 
It’s helpful to think of documents as files, and that these files consist of key-value 
pairs known as 
fields
 — this is similar to how models work. The values can be 
anything, strings, numbers, binary data, or even nested objects in a map format that 
resembles a JSON object. Collections, on the other hand, are simply groups of 
documents.
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When working with Cloud Firestore, there are a few rules to keep in mind:
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