Editing the wp-config.php file to load in another file if available. Makes working across multiple environments easier. Bonus tip; set your live site in wp-config.php and all other locations in wp-config-local.php. I also install WP in it's own directory making it easier to use git submodules.

wp-config-local.php

<?php

// ** MySQL settings - You can get this info from your web host ** //
/** The name of the database for WordPress */
define('DB_NAME', '...');

/** MySQL database username */
define('DB_USER', '...');

/** MySQL database password */
define('DB_PASSWORD', '...');

/** MySQL hostname */
define('DB_HOST', '127.0.0.1');

/**
 * For developers: WordPress debugging mode.
 *
 * Change this to true to enable the display of notices during development.
 * It is strongly recommended that plugin and theme developers use WP_DEBUG
 * in their development environments.
 */
define('WP_DEBUG', true);

/**
 * Server name
 *
 * The domain overwrite for WordPress. By default set automatically but can be
 * written here.
 */
define('WP_SERVER_NAME', $_SERVER['HTTP_HOST']);

/**
 * Dev Site
 *
 * We can tell the code this is a dev site and thus write certain conditions
 * for this.
 */
define('WP_DEV', true);

wp_config.php

<?php 

// ...

/**
 * Check for wp-config-local.php
 *
 * If there is a local-config.php file then we use that to over-write settings
 * make in this file with those in the dev file. Keep in mind that this should
 * be overwritten for dev and the live settings should stay here (unless you
 * are security paranoid).
 */
if( file_exists( dirname( __FILE__ ) . '/wp-config-local.php' ) ) {
    include( dirname( __FILE__ ) . '/wp-config-local.php' );
} else { 

    // ** MySQL settings - You can get this info from your web host ** //
    /** The name of the database for WordPress */
    define('DB_NAME', '...');

    /** MySQL database username */
    define('DB_USER', '...');

    /** MySQL database password */
    define('DB_PASSWORD', '...');

    /** MySQL hostname */
    define('DB_HOST', '...');

    /**
     * For developers: WordPress debugging mode.
     *
     * Change this to true to enable the display of notices during development.
     * It is strongly recommended that plugin and theme developers use WP_DEBUG
     * in their development environments.
     */
    define('WP_DEBUG', false);

    /**
     * Server name
     *
     * The domain overwrite for WordPress. By default set automatically but can be
     * written here.
     */
    define('WP_SERVER_NAME', $_SERVER['HTTP_HOST']);

    /**
     * Dev Site
     *
     * We can tell the code this is a dev site and thus write certain conditions
     * for this.
     */
    define('WP_DEV', false);

}

// ...

/**
 * Set custom paths
 *
 * These are required because wordpress is installed in a subdirectory.
 */
define('WP_SITEURL', 'http://' . WP_SERVER_NAME . '/wp');
define('WP_HOME',    'http://' . WP_SERVER_NAME . '');
define('WP_CONTENT_DIR', __dir__ . '/content');
define('WP_CONTENT_URL', 'http://' . WP_SERVER_NAME . '/content');

// ...