If your front and back doors are hollow, you need to replace them immediately. How do you know if your door is hollow? Simply knock on it. Hollow doors are merely sheets of veneer over a cardboard core. All exterior doors should be solid and made from the following  materials:  Fiberglass Solid wood Solid wood core (a layer of veneer over solid wood) Metal (Note: make sure metal doors are reinforced inside and have what is called a lock block. Otherwise, they can be bent out of the frame using a car jack) Having a door open in this way helps absorb any type of forced entry. For maximum security, all doors should be windowless, and you should not have windows close enough to the door so that a thief could break the window and unlock the door from the inside. A deadbolt isn't much help on any door like this for that reason. A big dog's the only possible hindrance with these doors, but only with the landlord's permission.  If you do have sliding glass doors, glass door panels or nearby windows, however, cover the glass with a security grate or grille on the outside or a clear, unbreakable polycarbonate panel secured behind the glass on the inside.

TL;DR in Indonesian:
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