How to make a post NOT show up on the front page

Please check:

https://codex.www.ads-software.com/The_Loop#Exclude_Posts_From_Some_Category

Hope this will help you..

Use the is_page() conditional.

https://codex.www.ads-software.com/Conditional_Tags#A_PAGE_Page

Eg:

<?php if(have_posts()) : while(have_posts()) : the_post(); ?>
if(is_page('42')) continue;?>