Parents must ensure that every child knows: 

 His/her name and address
 How to use a telephone
 How to dial `100` in emergencies
 How to contact only police officers or people they know for assistance
 Not to get into a vehicle or follow anyone without a parent`s consent
 If necessary, to reach people the child`s family trusts, such as relatives or friends
 Not to open the door when someone knocks and when their parents are not at home as well as to never to tell anyone on the phone that they are alone
 Not to accept `gifts` offered by strangers