Firebase

1. Firebase Projects and SDKs

   Projects, apps, config, the relationship to Google Cloud, and SDK initialization.

2. Authentication

   Sign-in providers, ID tokens, custom claims, anonymous auth, and session handling.

3. Cloud Firestore

   Document and collection data model, queries, indexes, transactions, and realtime listeners.

4. Realtime Database

   JSON tree data model, realtime sync, offline persistence, and data modeling.

5. Security Rules

   Declarative access rules for Firestore, Realtime Database, and Storage, request.auth, and rules testing.

6. Cloud Storage for Firebase

   File uploads and downloads, metadata, security rules, and resumable uploads.

7. Cloud Functions

   Event-triggered and HTTPS callable functions, Firestore and auth triggers, and deployment.

8. Hosting

   Static and dynamic content hosting, rewrites, redirects, preview channels, and CDN.

9. App Hosting

   Git-based hosting for Next.js and Angular apps backed by Cloud Run.

10. Data Connect

    Postgres-backed GraphQL schemas, queries, mutations, and generated SDKs.

11. App Check

    Attestation that requests come from your genuine app, providers, and enforcement.

12. Emulator Suite

    Local emulation of Auth, Firestore, Functions, and Storage for development and testing.

13. Cloud Messaging

    Push notifications, topics, device tokens, and notification vs data messages.

14. Remote Config

    Server-side parameters, feature flags, conditions, and A/B testing.

15. Analytics and Crashlytics

    Event logging, user properties, audiences, and crash reporting.

16. AI Logic

    Calling Gemini models from apps with Firebase SDKs and App Check protection.

Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.