is there any examples on how to edit templates?

Ok. I will play around with it. I am checking on this template: forum_list in ACP->appearance->templates, I saw the code in forum_list:

<xen:container var="$head.canonical"><link rel="canonical" href="{xen:link 'canonical:index'}" /></xen:container>
<xen:if is="{$xenOptions.boardDescription}"><xen:container var="$head.description">
    <meta name="description" content="{$xenOptions.boardDescription}" /></xen:container></xen:if>
<xen:container var="$head.openGraph">...

So in order to understand these codes, which documentation should I read? here it mentioned a little bit template syntax, but not full version.
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