How to change page content in wordpress?

Question

WordPress

There is a theme, but you need to completely redo the content of the page on the site, leaving only the header and footer of the theme.
To be specific: you need to make sure that categories with apartments are displayed on the page, and when you click on one of the categories, another page with a description pops up.
So, the main question: how can I display these categories and so that the client can add a category from the control panel?
As a result, it should look like this: www.libertyfly.ru/nomera (like in the center)
PS I'm not asking you to do everything, but just tell me how it's done in general. I do not quite understand wordpress Thank you very much in
advance for your answer.

Answer 1

1. By the hands of an experienced CSS coder through the :target pseudo-class
2. By the hands of an experienced JS (jQuery) coder, by changing the html blocks, binding them to buttons, as in your example.
3. The output version of the block "for the smallest" will most likely have to be done in php, I personally have not seen ready-made solutions for this.
I had to do the same for clients.