Explore Firebase's unified development platform; gain insights into authentication, Firestore, Cloud Functions, and deployment with CLI. Delve into hands-on web application creation and comprehensive tools.

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Firebase lesson

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Firebase is a unified application development platform to create, deploy, and monitor web and mobile experiences. It unites common product functions in a single platform, freeing engineers to create functionality and user experience rather than having to create the infrastructure.

This course is a comprehensive introduction to the Firebase 9 SDK through hands-on development of a web application. You’ll start with basic concepts and functions like authentication, database, and Cloud Storage with Firestore. You’ll then learn Cloud Functions for Firebase, environment variables, Security Rules, and hosting capabilities before deploying an application using the command line interface (CLI). At each step, you’ll get hands-on exercises to modify the code, see real-time output in your browser, and finish with an assessment.

By the end of this course, you’ll have all the tools you need to build and deploy a web application with the Firebase 9 SDK—the latest version of Firebase.

A Complete Guide to Firebase on the Web

**Cloud Firestore** is a flexible, scalable, real-time NoSQL cloud database provided by Firebase for storing application data. Data is stored as #key# documents: A set of key-value pairs stored in a collection. It can also contain subcollections. #key#, organized into #key# collections: A collection is a group of documents. #key#, and synchronized in real-time across multiple client applications. Cloud Firestore seamlessly integrates with other Firebase and Google Cloud products. Like the Realtime Database, it also offers offline support for all client applications.

# How it works
Cloud Firestore stores data as _documents_. A **document** is a unit of storage made of a set of key-value pairs. It supports various data types—strings, numbers, booleans, arrays—and subcollections. Documents in Cloud Firestore are stored in a _collection_. A **collection** is a container for documents that organizes data and helps build efficient queries. We can also create subcollections within documents. However, collections in Firestore can only contain documents.

Cloud Firestore allows shallow querying. Therefore, we can retrieve individual, specific documents or all documents in a collection or subcollection. We can dd sort, filter, and limit our queries or cursors to paginate our results. We can also add real-time listeners to update the application by retrieving data whenever changes occur in the database.

Cloud Firestore also persists data to the local cache, making it optimized for offline usage. Whenever a user goes offline, their application is still able to read, write, and listen to data. This data then synchronizes when the user comes online.



# Implementation
Like any other Firebase service, we must first import the Cloud Firestore’s getter function from its subpackage and then initialize it. We do this by importing the `getFirestore` function from the `firebase/firestore` subpackage. This function then takes a reference to the Firebase App instance as a parameter:


Get a brief introduction to Cloud Firestore.

Introduction

Get Started with Firebase

Firebase Authentication

The Firebase Realtime Database

Cloud Firestore

Cloud Storage for Firebase

The Firebase CLI

Cloud Functions

Environment Variables in Firebase

Firebase Security Rules

Firebase Hosting

Firebase Assessment

Conclusion

Appendix

Introduction to Cloud Firestore

How it works