# Getting started with Amazon Chime SDK messaging
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The topics in this section explain how to start building an Amazon Chime SDK messaging application.

**Topics**
+ [Creating an AppInstance for Amazon Chime SDK messaging](create-app-instance.md)
+ [Making SDK calls from a back-end service for Amazon Chime SDK messaging](call-from-backend.md)
+ [Authenticating end-user client applications for Amazon Chime SDK messaging](auth-client-apps.md)
+ [Creating channels for Amazon Chime SDK messaging](creating-channels.md)
+ [Sending messages in Amazon Chime SDK messaging](send-messages.md)
+ [Using ExpirationSettings in Amazon Chime SDK messaging](expiration.md)
+ [Using WebSockets to receive messages in Amazon Chime SDK messaging](websockets.md)
+ [Configuring attachments in Amazon Chime SDK messaging](configure-attachments.md)