One trick to keeping all your site's various re-used values in the same place.

hanes_options.php

<?php
/***
 *       _____                      _ _     _       _   _
 *      / ____|                    | (_)   | |     | | (_)
 *     | |     ___  _ __  ___  ___ | |_  __| | __ _| |_ _ _ __   __ _
 *     | |    / _ \| '_ \/ __|/ _ \| | |/ _` |/ _` | __| | '_ \ / _` |
 *     | |___| (_) | | | \__ \ (_) | | | (_| | (_| | |_| | | | | (_| |
 *      \_____\___/|_| |_|___/\___/|_|_|\__,_|\__,_|\__|_|_| |_|\__, |
 *      / __ \      | | (_)                                      __/ |
 *     | |  | |_ __ | |_ _  ___  _ __  ___                      |___/
 *     | |  | | '_ \| __| |/ _ \| '_ \/ __|
 *     | |__| | |_) | |_| | (_) | | | \__ \
 *      \____/| .__/ \__|_|\___/|_| |_|___/
 *            | |
 *            |_|
 */


/***
 *                                   _   _
 *         /\                       | | (_)
 *        /  \   _ __     ___  _ __ | |_ _  ___  _ __  ___
 *       / /\ \ | '_ \   / _ \| '_ \| __| |/ _ \| '_ \/ __|
 *      / ____ \| | | | | (_) | |_) | |_| | (_) | | | \__ \
 *     /_/    \_\_| |_|  \___/| .__/ \__|_|\___/|_| |_|___/
 *       __                  _| |_
 *      / _|                | |_(_)
 *     | |_ _   _ _ __   ___| |_ _  ___  _ __
 *     |  _| | | | '_ \ / __| __| |/ _ \| '_ \
 *     | | | |_| | | | | (__| |_| | (_) | | | |
 *     |_|  \__,_|_| |_|\___|\__|_|\___/|_| |_|
 *
 *
 * Basically a function that serves as a repository for all your re-used values
 * Stick this at the top of your functions.php
 * or inside a variables.php (don't forget to include('variables.php') it somewhere like functions.php )
 *
 */

function allhanesondeck_options( $key ) {

	// You can add in all sort of values that you re-use a lot
	$my_options = array(
		'columns_cat'                 => 86,
		'contact_page_id'             => 12,
		'special_category_id'         => 17,
		'cat_pics_ids'                => array( 12, 14, 19 ),
		'text_that_keeps_coming_back' => __( 'Tired of typing this text over and over', 'hanes_text_domain' ),
	);

	// Making sure that it's actually set. If not, return false
	// Note: could get confusing if your $key's value actually IS (bool) false
	return isset($my_options[$key]) ? $my_options[$key] : false;
}

/**
 * Then, anywhere in your code, you can simply use the above.
 * "But that makes it so much longer!
 * - Ah! But remember that time you had to go through all your code because your
 *      customer inadvertently deleted a category and then re-created one and assigned
 *      posts to it?
 *      This way, you change it once and everything else is still good to go
 */
?>
<a href="<?php get_category_link( allhanesondeck_options( 'contact_page_id' ) ); ?>"><?php _e('Contact Us!', 'hanes_text_domain'); ?></a>