• when you demo creating a docker image on your dev machine, mention that it is an arm64 arch and that the task definition specifies this as a setting. If you do not want to specify this setting in task defn then you have to use "docker build --platform ".

I also create the ECR repo manually and pushed the image already , no template for that...yet

• make sure CW log group exists befpre /ecs/my-nginx-task

• execute cluster template first

• task definition second

• service last (takes time, since ALB)