Need to add seperate categories

Hi, I need to have a category list with things related to my blog, and another seperate category list with for example general interest. Can anyone tell me how it is possible in WordPress?
Here is an example:

<h2>Design Category</h2>
<ul><li>graphic</li>
<li>web</li>
<li>interface design</li>
</ul>

<h2>General Interest Category</h2>
<ul><li>cool websites</li>
<li>Resources</li>
</ul>

I tried looking for a plugin but I didn’t find any.