This video (episode 5 of 12) creates the users and posts collection in our Firestore database. We create some fake posts by referencing the users from Firebase Auth and uploading images from Firebase Storage and referencing the image URL. Note that we don't actually use the age attribute that I added in the users collection, I just did that for demo purposes :) InstaFire playlist:    • InstaFire: Android Instagram Clone wi...   Helpful links for more information: ➤ What is Firebase: https://firebase.google.com/ ➤ Good explanation of Firestore and NoSQL: https://www.youtube.com/watch?v=v_hR4K4auoQ. ➤ Firestore: https://firebase.google.com/docs/firestore ➤ Coding in Flow playlist about Firebase Storage: https://www.youtube.com/watch?v=MfCiiTEwt3g In these videos, we build a basic Android Instagram app clone using Firebase, written in Kotlin. Our app allows the user to sign in and create posts with an image and description. We use Firebase, an app development platform developed by Google, to power our application. We use various Firebase services such as Authentication, Storage, and Firestore to build our app.