Firestore data model

https://firebase.google.com/docs/firestore/data-model

• How to Structure Your Data | Get to Know Cloud Firestore #5

• How do queries work in Cloud Firestore? | Get to Know Cloud Firestore #2

• Maps, Arrays and Subcollections, Oh My! | Get to Know Cloud Firestore #4

• Understanding Collection Group Queries in Cloud Firestore

• how to add sub collection to a document in firestore? [closed]

• Firestore Sub-Collections

• Best Practices: Arrays in Firebase