admin 
Free Firestore Data Modeling Course videos available to exploit. Learn how to model data and optimize queries with Cloud Firestore.
Cloud Firestore Data model
Cloud Firestore is a NoSQL, document-oriented database. Unlike a SQL database, there are no tables or rows. Instead, you store data in documents, which are organized into collections.
Each document contains a set of key-value pairs. Cloud Firestore is optimized for storing large collections of small documents.
All documents must be stored in collections. Documents can contain subcollections and nested objects, both of which can include primitive fields like strings or complex objects like lists.
Collections and documents are created implicitly in Cloud Firestore. Simply assign data to a document within a collection. If either the collection or document does not exist, Cloud Firestore creates it.
