You could also write the following

```
<a href="{{.Site.BaseURL}}/blog/">Back to Blog</a>
```

if you want the full path.

If you want to use an even more abstracted approach (eg, with a `/_default/single.html`), you could also do this:

```
<a href="{{.Site.BaseURL}}/{{.Section}}">Back to {{.Section}}</a>
```

You could also use the `{{ whatever | pluralize }}` depending on your use case.