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More generically - how do I retrieve a collection of resources and then iterate over them to make more resources?

Most of our resources have a

getX

function. For route tables, we've got

getRouteTables()

: https://www.pulumi.com/docs/reference/pkg/aws/ec2/getroutetables/#getroutetablesfilter You can pass in the vpc id into the filter arguments and that should return the route tables for that VPC

A bit further, but now I am not allowed to use the Vpc I made earlier's ID?

const privateRouteTables = aws.ec2.getRouteTables({
    vpcId: vpc.id,
    filters: [
        {
            name: 'association.subnet-id',
            values: pulumi.output(vpc.privateSubnetIds).apply(snids => snids)
        }
    ]
});

// line 2
Type 'Output<string>' is not assignable to type 'string | undefined'.
  Type 'Output<string>' is not assignable to type 'string'.

You'll need to use

apply

here: https://www.pulumi.com/docs/intro/concepts/inputs-outputs/#apply

I tried this:

vpcId: vpc.id.apply(id => id),

with the exact same error as above

Yes, you need to use the id inside the apply(). You don't return it from the apply.