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That indicates your currently selected stack. If you run `pulumi stack select dev`, you will see the asterisk appearing after `dev`.

`staging` and `dev` both have a pink row in the website but only `dev` has a `yml` file. Is this wrong?

Not necessarily. My assumption for now is you have set stack configuration values on `dev`, but not yet on `staging` . Am I right on this?

I haven't really worked out what the yml files do yet

I'm just observing that something is inconsistent

The yaml files represent the config for each of the stacks you set up using your Pulumi project. I suggest you give the stack documentation another read:
<https://www.pulumi.com/docs/intro/concepts/stack/>

So to create a new stack I need to use the command line command _and then_ create a new `yml` file?

My next problem is going to be that I can't write the C# because I don't know anything about Azure, isn't it?

To create a new stack, you only run `pulumi stack init` , you don't have to create a yaml file yourself. If you set any stack configuration using `pulumi config set` afterwards, Pulumi will create the yml file for your stack when it doesn't exist.

But I don't understand this question:
&gt; My next problem is going to be that I can't write the C# because I don't know anything about Azure, isn't it?
