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 < http://127.0.0.1:4000/project/node.js/ >

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 https://jekyllrb.com/docs/permalinks/ 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.