When stack creation fails:

1. Automatic Rollback: CloudFormation automatically deletes all successfully created resources
2. Stack State: Stack goes to ROLLBACK_COMPLETE state
3. Error Information: Detailed error messages available in Events tab
4. Billing: You're only charged for resources that existed during the failed creation period
   Prevention strategies:

• Validate templates before deployment
• Use --disable-rollback flag only for debugging
• Implement proper IAM permissions
• Check service limits and quotas
• Use change sets for updates
  Example debugging:

aws cloudformation describe-stack-events --stack-name my-stack