Yahoo is a searchable directory.
You can browse through a hierarchy of information.
You can navigate your way through a directory from the general to the very specific.
There are fourteen top categories.
When you are in Yahoo's hierarchy directory, the title at the top of the page is hyperlinked. Each section of the title is linked and you can move around within those categories.

Let's browse

I want to find information about house plants.
Select a category from the Yahoo home page where you think your subject might be.
Click on Recreation & Sports because Recreation seems to be the best choice
Click on Home and Garden.
Click on Houseplants.
In this area there are several categories of houseplants and a list of Web sites about houseplants.