Some basic knowledge will increase their confidence and self-reliance. And you'll feel better knowing that they know how to cope when you're not around. And more and more kids today spend time at home and at play alone while their parents are at work. Children should know, of course, that the reason for learning and following safety rules is because they're loved. Rules should not be seen as arbitrary and adults should take care to be consistent with the rules they teach, and practice what they preach.
Friendly strangers can be dangerous strangers.
Strangers who offer treats to children may be offering threats instead. Children will encounter strangers when you're not around. Most strangers are well-meaning and not to be feared. But because children are trusting and vulnerable, they can fall for offers by adults who seem kind, but are not. Never get close to a car if a stranger calls out to you for directions or anything else.