My DH tried to have a conversation with dd, who is almost 5, about strangers. He asked her what she would do if a stranger offered her sweets to go with him. Dd said she would take them and go, so DH tried to explain why that's a bad idea without going into too much detail but he isn't sure she gets it.
Today, at a busy softplay, I tried again but all she has is lots of questions about why she can't go with strangers or talk to them.
So what do you tell your kids at age 4 almost 5, without scaring them? Dd is one who will dwell on things hence our wanting to be careful how we approach this.