Help:Templates
From LFS Manual
Jump to navigationJump to searchCreating a template
To create a new template, create a new page under the Template namespace, e.g. Template:Welcome.
Paste the following wikitext into the template content. This will automatically include a /doc subpage in a special documentation box. Then you can edit the template content inside the <includeonly>
tags.
<includeonly>Welcome!</includeonly><noinclude>{{documentation}}</noinclude>
Using templates
https://www.mediawiki.org/wiki/Help:Templates
Check the template index for a list of all useable templates for LFS Manual.