To protect your door and this way your home and family against burglary you should invest in the security of your door. With an additional door lock and the basic elements you increase your safety effectively.
The basic fittings for any entrance door include tested security strike plates with wall anchors, strong mortise locks, sturdy door fittings with pulling protection and door cylinders with a security card.
Basic mechanical protection is provided by proper fitting of a door lock as a reinforced bolt lock or an additional door lock and hinge-side security devices. The prerequisite for this is a sufficiently strong door construction.