Saving Data on Android

Where to go from here?
You covered a lot in this chapter. You learned how to read data from Firestore and 
listen for data changes in real-time. You also learned what queries are and how to 
use them only to fetch specific documents from a collection.
To learn more about those features, you can check out the official 
documentation
.
WhatsUp
 app is now complete, but it has one big flaw. Anyone can read and write 
the data to the database. In 
"Chapter 19: Securing data in Cloud Firestore"
 you'll learn 
how to secure the data in the database and to restrict access to the data.
Saving Data on Android
Chapter 18: Reading Data from Cloud Firestore
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