Firebase Skill Firebase/Firestore patterns for web and mobile applications with real-time data, offline support, and security rules. Sources: Firebase Docs | Firestore Best Practices | Security Rules --- Core Principle Denormalize with purpose, secure with rules, scale horizontally. Firestore is a document database - embrace denormalization for read efficiency. Security rules are your server-side validation. Design for your access patterns. --- Firebase Stack | Service | Purpose | |---------|---------| | Firestore | NoSQL document database with real-time sync | | Authentication | User auth, O…