Hardening WordPress – WP

replace wp_ db prefix
rename folders wp-content, uploads, plugins, wp-admin, wp-include

define('UPLOADS', 'media' ); // we renamed uploads and moved it level up
define('WP_CONTENT_DIR', '/path/to/wordpress/dir/content'); // no host name, no trailing slash
define('WP_CONTENT_URL', 'http://example.com/content');
define('WP_PLUGIN_DIR', '/path/to/wordpress/dir/content/mod'); // no host name, no trailing slash
define('WP_PLUGIN_URL', 'http://example.com/content/mod');

change cookie’s names

define('USER_COOKIE', 'my_user_cookie' );
define('PASS_COOKIE', 'my_pass_cookie' );
define('AUTH_COOKIE', 'my_auth_cookie' );
define('SECURE_AUTH_COOKIE', 'my_sec_cookie' );
define('LOGGED_IN_COOKIE', 'my_logged_cookie' );
define('TEST_COOKIE', 'my_test_cookie' );

Sources:

https://wpcerber.com/turn-wordpress-into-fort-knox/
https://developer.wordpress.org/advanced-administration/security/hardening/