Create 10 practical methods and strategies for secure and efficient secrets management in modern DevOps environments to reliably protect sensitive credentials, API keys, and certificates and to ensure secure automated deployments.

Context: [DevOps, Secrets Management, Security, Automation, CI/CD, Access Control, Encryption, Cloud Environments, Compliance, Infrastructure]

Goal: [Prevention of secret leaks, Ensuring access restrictions, Improving automation security, Compliance adherence]

For each method explain:
1) a concrete approach or technology (e.g. HashiCorp Vault, Kubernetes Secrets, environment variables with encryption)
2) the benefits for security, automation, and operational reliability
3) practical tips for implementation, possible challenges, and recommendations for tools or best practices

The methods should:
- be clearly understandable and directly implementable
- be suitable for small to large DevOps teams
- help minimize security risks caused by improper handling of secrets
- contribute to sustainable improvement of infrastructure and application security