You should always lock all doors and windows when you go out, whether you're popping to the end of the street or downstairs in your apartment complex, keep them locked.
Either way it will reduce your chances of falling victim to theft and at the very least, reduce the amount that's taken.
For optimal security consider fitting deadlocks or key operated security bolts to all external doors and key operated locks to all your accessible windows. If you do have deadlocks use them, as they make it harder for thieves to get out again.
Another step you may think about taking is adding a smart door lock - take a look at our future tech guide to see if they're worth investing in
You should also consider changing the locks when you move into a new home as the previous occupant may have copies of the keys, especially if the home was a rental property before.
If you're living in rented accommodation, speak to the landlord as you may need to provide them with a copy of the new keys.
Did you know that the average homeowner in the UK has 7 sets of keys for their home? This can make being secure in your new home tricky, so be sure to change the locks when you move in and always keep track of where your spare keys are. If you lose a set, don't hesitate to change the locks again!