Having one category posted in one page

You don’t have posts on pages, but you can use your “blogroll” for example to link to one specific category and when a post is in two categories, it will appear in either category list.

I’ve done this on blogs previously using the “page links to” plugin (I think) and using that so that, for example, a link at https://www.yoursitehere.com/news is actually going to posts in the news category. Works well.

create a page called category-x.php, copied form your themes category page, where x is the category id of “Computer & Photography”

open the newly created category-x.php file, near the top you should see a line like
<?php
/*
Template Name: category
*/
?>

if you don’t then add it and “change” category to “category – Computer & Photography”

got to admin and create a new page called, funny enough, Computer & Photography

on the right hand column in 2.7, and lower on the left hand side of the edit page, is page page option of template, its a drop down list, one of those listed should be “category – Computer & Photography”, select and save, now you have a page appearing on your menu that will display only post from the Computer & Photography category

see here
https://codex.www.ads-software.com/Category_Templates
for more info