Blog Category Help

I am looking for a way to list all related posts in the blog post sidebar.

1. I create a category page “IT Support” (same as category)
2. I create a post “IT Support For Dummies”
3. I select “IT Support” as the category.
4. When I go to the “IT Support for Dummies” post, I want to see a list (Menu/Links) of

all

of the “IT Support” posts in the sidebar.

I am using the Avada theme, and there is a blog sidebar widget. I need a widget to drag in to get this done.