Right way to customize login page and others things

[cpradio]

You might want to read this, which I think fits what you are looking to do, but just realize it is meant for sub-categories

Display boxes for subcategories above topic list

This guide explains how to display boxes for subcategories above the topic list in Discourse. Required user level: Administrator (or moderator if the moderators manage categories setting is enabled) There are four ways to display a list of sub-categories within the parent category: in rows (the default style) in rows with a list of some featured topics in boxes with only the name, logo, and description in boxes with name, logo, and a list of some featured t…