The best way to create pages like an ‘about’, ‘contact’ and etc [closed]

This should help get you started:

As mentioned in the Template Hierarchy page, you can create a template
for a specific page. To create a template for one specific page, copy
your existing page.php file and rename it with your page’s slug or ID:

1. page-{slug}.php
2. page-{ID}.php

For example: Your About page has a slug
of ‘about’ and an ID of 6. If your active theme’s folder has a file
named page-about.php or page-6.php, then WordPress will automatically
find and use that file to render the About page.