From the WordPress 3.2 version you already know that you can update WordPress automatically quickly and easily but ah friend! What if you have made modifications to some default theme or plugins? that may also be updated and you would lose all the changes.
That, but you can avoid this undesired side effect, since there is a constant that you can add to your WordPress configuration file the famous wp-config.php with which prevent WordPress kernel updates from affecting (touching) other folders . Come on, that will only update the WordPress kernel, nothing more .
Just add this line to your configuration file and save the changes: