Are there more pages to read? This How-To seems to focus on preparing to customize a block's appearance rather than actually doing the customization. I did not find any "next page" links off the article. Thanks.
Well, this article just describes where to find the files for custom templates. This is an overview of the structure of block templates. I find that helpful. For me, there is not much more information to expect.
You are allowed to delete your post for 5 minutes after it's posted.