How to create permalink page?

Dear developers

I am now creating a blog using jekyll

I’m creating a category page, but I have a problem

How can I customize this page?

under page is permalink page < >

I’ve tried it this way.

--- <test.html>
title: Categories
permalink: /:permalink/
`test hello world`

However, this page does not change and always appears as above

So my question is

How can i redesign under page?

Thank you very much for reading it.

Refer for official documentation on Permalinks

also, that page you are seeing is created by the built in server not by jekyll, it is just a directory listing as you don’t appear to have a page at that url.

I checked the article, but I’m not sure.