I just don’t GET THIS!

I’ve been thinking for days. I wanted to create something that looked like this:

http://www.watchanimeon.com/anime/dragonball/

With the preview image at the top with information and posts from the category listed at the bottom(Episode 153 etc.)

What I don’t understand is, how did he/she set it up?

When I navigate through the website, it looks like this:
Home>
Full list of episodes( http://www.watchanimeon.com/anime-list/ ) >
The category/post/page for the information and list of episodes (http://www.watchanimeon.com/anime/dragonball/ )>
Single posts/pages/categories with the video ( http://www.watchanimeon.com/dragonball-episode-117/ ).

Simple:
Home>List of categories/pages/posts>Information page with a list> Single post/page/category with the episode.

I just don’t get it, how?

Thanks.