CouchDB

1. Technical Overview

   Document storage, MVCC and the B-tree storage engine.

2. API Basics

   HTTP API, documents, revisions and databases.

3. Eventual Consistency

   Distributed consistency and conflicts.

4. Documents

   CRUD operations and document structure.

5. Design Documents

   Views, validation, update functions and filters.

6. Views

   MapReduce views and indexes.

7. Mango Queries

   Declarative JSON queries and indexes.

8. Replication

   Continuous, filtered and bidirectional replication.

9. Conflict Handling

   Detecting and resolving document conflicts.

10. Clustering

    Sharding, nodes and quorum.

11. Partitioned Databases

    Partition keys for efficient queries.

12. Authentication and Security

    Cookie, basic and JWT authentication and authorization.

13. Configuration

    Server configuration options.

14. Compaction and Maintenance

    Database and view compaction.

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