The `title` and `date` fields are standard parameters---the other fields are user-defined.
Access the custom parameters by [chaining] the [identifiers]:
```go-html-template
{{ .Params.display_related }} → true
{{ .Params.author.name }} → John Smith
```
In the template example above, each of the keys is a valid identifier. For example, none of the keys contains a hyphen. To access a key that is not a valid identifier, use the [`index`] function: