How to Create a Category Post Page in Weaver II
Leo presents a short, clear video on how to create a category page here:
It works well for most themes, but not all. One theme it doesn't work for is Weaver II. It shows 1 post per page which negates the purpose. (If your theme is not Weaver II, I suggest that you try Leo's method.)
The good news is that Weaver II has all the options in it to achieve the same result. Just follow these steps and you will have a page showing excerpts of all the posts in a category of your choice!
Note: It is best to first try this out with a dummy site so that you don't mess up your domain site in any way. As you proceed through the steps, you can create posts/categories/pages with nonsensical information for the sake of creating them. DO NOT use content from your domain site to prevent duplicate content issues. Once you have the technique mastered, just apply it on your actual site.