Lock the front door!
By using the key to lock the door as well, especially at night, will mean the house is secure from burglars looking for an easy and quiet way into a home.
A family should also have a fire escape plan where everyone knows where the key is kept in the event of an emergency. For more information take a look at the Royal Berkshire Fire and Rescue for how to make a household escape plan https://www.rbfrs.co.uk/your-safety/safety-at-home/making-an-escape-plan/