Getting Started with Cloud Firestore on the Web
What is a NoSQL Database? How is Cloud Firestore Structured?
Getting Started with Cloud Firestore with NodeJS
Model Relational Data in Firestore NoSQL
Lets learn more Firestore - Maps Arrays and Subcollections
Started Tech Buzz
Awesome post by Google Developer Advocate Todd Kerpelman explaining how Firestore works. (Follow him here on Twitter)