how do I insert a new category into my sidebar

Assuming you are using either the Category Widget or the template tag, wp_list_categories(), in you sidebar then you should be able to create a new category, assign that category to at least one post and that category should be listed.

I think I have not made myself clear in what I actually wanted. I should have not used the term category. In my side bar are various headings (Archives, categories, meta etc). I want to know how I could get, say, articles or ebooks as one of those main headings and under those headings have the list of articles and the list of ebooks.

Hi,

You can do it with category and subcategory features of wordpress..

https://codex.www.ads-software.com/Manage_Categories_SubPanel
https://www.ads-software.com/tags/subcategory

Thanks,

Shane G.

I think I understand what Jackiebk means, and I want to do the same.

I have multiple categories. I know how to list them all in the sidebar.

But, I want a list of links to only one of them in the sidebar, without showing the others.

Is it possible to do that?

Thanks!