# User Guide

This chapter is designed to help users get started with EMQX, and it covers a wide range of topics from security and access control, messaging services and subscriptions, data management, to system administration and monitoring, as well as advanced features and extensions.

Security and Access Control: This section covers topics related to ensuring the security of data and controlling access.

• Authentication
• Publish and Subscribe ACL
• Blacklist

Messaging Services and Subscriptions: This part includes all topics related to managing message processing and subscriptions.

• Shared Subscriptions
• Exclusive Subscriptions
• Message Retransmission
• Message Bridging

Data Management: This section includes topics related to data processing and storage.

• Message Persistence
• Data Import/Export

Distributed Clustering: This part explains how to manage and work with EMQX cluster.

• Distributed Cluster
• Cluster Rebalancing

System Management and Monitoring: This section includes routine operation and maintenance topics, such as subscribing to logs through the $SYS system topic, monitoring metrics, managing alarms, and rate limiting.

• $SYS System Topic
• Metrics Monitoring
• Alarms
• Rate Limiting

Advanced Features and Extensions: This section describes the advanced features and extensions that are supported by EMQX.

• Hook
• Inflight Window and Message Queue