Template get parent category

[dogs]

Hey!

How do I get the parent of the actual category in a Tamplate?

Im just looking around and found this:

<!-- IF breadcrumbs.length -->
<ol class="breadcrumb">
	<!-- BEGIN breadcrumbs -->
	<li<!-- IF @last --> component="breadcrumb/current"<!-- ENDIF @last --> itemscope="itemscope" itemtype="http://data-vocabulary.org/Breadcrumb" <!-- IF @last -->class="active"<!-- ENDIF @last -->>
		<!-- IF !@last --><a href="{breadcrumbs.url}" itemprop="url"><!-- ENDIF !@last -->
			<span itemprop="title">
				{breadcrumbs.text}
				<!-- IF @last -->
				<!-- IF !feeds:disableRSS -->
				<!-- IF rssFeedUrl --><a target="_blank" href="{rssFeedUrl}"><i class="fa fa-rss-square"></i></a><!-- ENDIF rssFeedUrl --><!-- ENDIF !feeds:disableRSS -->
				<!-- ENDIF @last -->
			</span>
		<!-- IF !@last --></a><!-- ENDIF !@last -->
	</li>
	<!-- END breadcrumbs -->
</ol>
<!-- ENDIF breadcrumbs.length -->

How can I get the parent category-Name of the current (sub)category?
Is there any reference I can use for such things in the future?

What I like to do:

1. Get the parent of the actual category
2. use this value e.g. "foobar" to call the API of an external software and get JSON-Object depend on value "foobar"
3. convert the data to display it between breadcrumbs / new topic in the nodeBB Forum

Is it the right way to handle this with a template or am I completely wrong?
I just installed nodeBB and I also do have no idea about node.js and all that stuff so sorry I am a noob.

Kind regards, Pascal.