Creating Javascript-Code in Head Section
Sometimes you need to add global HTML-Code to the head section of your page (e.g. for adding tracking code). You can do this by creating a topic that's rendered as an HTML widget.
To do so, navigate to Admin > CMS > Topics > Add new > Render as HTML widget. Create a new topic and check the option Render as HTML widget.
Now, just choose the Widget zone head_html_tag and you're done.