# Use policies
<a name="policy-use-policies"></a>

This section explains how to create and manage Cedar policies.

**Topics**
+ [Add policies to the Policy Engine](add-policies-to-engine.md)
+ [Create gateway with Policy Engine](create-gateway-with-policy.md)
+ [Update existing gateway with Policy Engine](update-gateway-with-policy.md)
+ [Policy enforcement modes](policy-enforcement-modes.md)
+ [Use an AgentCore Gateway with Policy in AgentCore](use-gateway-with-policy.md)
+ [Manage Policies and Policy Engines](manage-policies-engines.md)
+ [Errors](policy-use-errors.md)