If it's a child.
First of all, when a stranger knocks at the door, the child must not open the door casually. Even if they claim to be colleagues or friends of their parents' work units, or employees who charge fees, they should write down something to tell their parents instead of opening the door to strangers.
Secondly, if a stranger doesn't leave, keeps ringing the doorbell and knocking at the door, or wants to break into the house, he can ask his neighbor for help first, call the police in time, and tell the police uncle's home address and the other person's situation.
If it's a woman
First of all, we should be vigilant, contact familiar people in time and confirm each other's identity documents. If the other party is suspicious, don't open the door, especially don't open the door with a crack. This is extremely unsafe and will leave room for operation. Seeing the cat's eye is actually very dangerous, because if the other person is two people, one person can stand within the cat's eye range, and the other person can wait for the opportunity, so it is best not to disturb, confirm the identity of the other person in time, and forget the reason. Be sure to call the police in time when the situation is suspicious, and inform the police of the situation to prevent life-threatening.
Secondly, even if you confirm your identity, don't invite others into the house at will, otherwise once the other party closes the door, there is no way out.
Finally, be careful when receiving express delivery. Don't sign for unknown express delivery at will, and don't open the door for unfamiliar couriers to prevent potential risks.
If it's male
First, confirm the identity of the other party. Many people don't open the door for each other. They should inform their relatives and friends in time. If the situation is suspicious, they should call the police in time and inform the police.
Secondly, pay more attention after opening the door, don't expose your fragile parts such as your back to the other party, don't let the other party into the house at will, and try to pick up things at the door.
The best situation is that neighbors watch each other and help each other. If there is any situation, contact the community security in time, and help the neighbors as much as possible when they need help. Sometimes a phone call can make a complete difference.