How to Add Firebase Firestore to an Android App

This is based on a presentation I gave on how to add Firebase Firestore to an Android application. The code is written in Kotlin.

GitHub if you want to code along:

Set up Firebase Project:
Add Android app to Firebase Project: 0:43
Create and initialize Firestore database: 1:40

Get live Firestore data:
Get collection, "movieTitles": 3:10
Get collection, "movies": 6:32
Get collection, "games": 8:57
Get collection, "concerts": 10:38

Get Firestore document:
Get specific movie document: 12:27
Get specific user document: 14:21

Update Firestore document:
Update user document: 17:24