• Create reusable templates and share them across the organization.
• They represent code so put them under versioning systems.
• Avoid having a single template and create multiple templates grouped by tier, owner, function, or lifecycle. Think of loosely coupled components that are service providers.
• Design complex stacks using nested stacks to promote reusability.
• CloudFormation is no silver bullet, take advantage of the strongest points of the service, and complement with OpsWorks, Terraform, Ansible, and so on.