Though Drupal community provides their user with security fixes time to time, still the notorious trespassers always try to intrude your websites security. So check out few basic security tips that don't need any programing knowledge to shield your website against hackers.
At first, we have to find out what does “of them all” refer to in the title. Did I mean WordPress, Joomla and other open source CMSs, or proprietary CMSs? Well, I meant both.