In this AWS re:Inforce 2022 session, Brigid and Matt discuss IAM best practices for securing AWS resources. They cover key topics including using temporary credentials for human and workload access, implementing least-privilege permissions, and leveraging tools like IAM Access Analyzer for policy generation and validation. The presenters demonstrate how to use IAM Identity Center (formerly AWS SSO) for federated access and walk through the process of generating fine-grained policies using Access Analyzer. They emphasize the importance of regularly reviewing and refining permissions, establishing guardrails across multiple accounts, and implementing a data perimeter for enhanced security. The session provides practical guidance on implementing these best practices to improve the security posture of AWS environments.