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I'd avoid default VPC entirely if possible. the decision lies upon your use case and how many resources like this you'll need to produce. Ideally, I find it easier to read the code to learn about the relationship between resources rather than clicking through AWS Console. But there are cases where is it easier to create a resource manually and then inside pulumi just read the value (ARN or so,) from config or using

Get<resource>

function provided via the provider. Additionally, you can import an existing resource that was created manually and start managing it from pulumi. I hope this helps you to answer the question yourself.

Thanks Jan, yes I am planning to setup Redis and PostGresql and deployed thru IaC. This greatly helps!