This video demonstrates the setup of below tasks to automate stop & start of Amazon EC2 instances:
1. Tag EC2 instances and create a resource group.
2. Create an AWS Systems Manager Maintenance window to register targets and AWS-StartEC2Instance Automation document task.
3. Create an AWS Systems Manager Maintenance window to register targets and AWS-StopEC2Instance Automation document task.

Links:

Automatically stop and start an Amazon RDS DB instance using AWS Systems Manager Maintenance Windows:
https://docs.aws.amazon.com/prescript...

About pseudo parameters:
https://docs.aws.amazon.com/systems-m...