The AWS shared responsibility model divides security responsibilities between AWS and its customers, with AWS responsible for the infrastructure's security and customers responsible for securing everything within that infrastructure. Building an AWS cloud security strategy is crucial to ensure data, code, and cloud workloads are protected. The strategy should include elements like visibility across cloud environments, zero trust policies, cloud native security tools, DevSecOps strategies, regular patches and updates, security automation, defense in depth layering, and implementing eight best practices such as access controls, threat and incident response planning, detection monitoring and alerting, data encryption, backing up data, keeping AWS up to date, planning for regulatory compliance, and scaling security across the development workflow. By adopting these best practices, organizations can protect their applications and organization from various threats.