Kubernetes Secrets provide a secure way to store and manage sensitive data for containerized applications running in Kubernetes clusters. To create and use secrets in Kubernetes, there are three methods: using the command line, configuration files, or Kustomize generators. The best method depends on the specific requirements of the environment. Once created, secrets can be accessed by casting them into volumes or as environment variables within containers. Best practices for managing Kubernetes Secrets include version control, security measures such as Role-Based Access Control and network policies, resource management, deployment strategies like immutable infrastructure and rolling updates, monitoring tools, logging solutions, backup and recovery plans, and scalability techniques like horizontal pod autoscalers. Alternatives to Kubernetes Secrets include integrating cloud vendor secrets management tools or running a third-party secrets manager within Pods.