Another note: when you get to the step where you build your first image, the command would be more accurately described as:
docker build -t YOUR_DOCKER_USERNAME/THE_OS_YOU_SELECTED .
well the tagging is pretty much up to you it could be chris/node-web-app. You are right though that you need to name it in a specific way when you tag it for the container registry for Azure for example dev.to/azure/learn-how-you-can-bui... for your container registry to accept it. I'm sure that's true for AWS as well
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