# Introduction

This section of the reference guide intends to cover in detail the capabilities that the Axon Framework provides to help build applications based on [CQRS/DDD](/reference-guide-feature/architecture-overview.md#ddd-and-cqrs) and [Event Sourcing](/reference-guide-feature/architecture-overview/event-sourcing.md)

A summary of the various sub-sections is given below.

| Sub-Section                                                                                   | Purpose                                                           |
| --------------------------------------------------------------------------------------------- | ----------------------------------------------------------------- |
| [Messaging Concepts](/reference-guide-feature/axon-framework/messaging-concepts.md)           | Conceptual overview of "Messages" within the Axon Framework       |
| [Commands](/reference-guide-feature/axon-framework/axon-framework-commands.md)                | Command Message Development using the Axon Framework              |
| [Events](/reference-guide-feature/axon-framework/events.md)                                   | Event Message Development using the Axon Framework                |
| [Queries](/reference-guide-feature/axon-framework/queries.md)                                 | Query Message Development using the Axon Framework                |
| [Sagas](/reference-guide-feature/axon-framework/sagas.md)                                     | Long Running Transaction development using the Axon Framework     |
| [Testing](/reference-guide-feature/axon-framework/testing.md)                                 | Testing capabilities provided by the Axon Framework               |
| [Tuning](/reference-guide-feature/axon-framework/tuning.md)                                   | Tuning capabilities provided by the Axon Framework                |
| [Monitoring and Metrics](/reference-guide-feature/axon-framework/monitoring-and-metrics.md)   | Monitoring and Metric capabilities provided by the Axon Framework |
| [Spring Boot Integration](/reference-guide-feature/axon-framework/spring-boot-integration.md) | Axon Framework integration with Spring Boot                       |
| [Modules](/reference-guide-feature/axon-framework/modules.md)                                 | Modules provided by the Axon Framework                            |


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