Most break-ins happen through a door that was simply left unlocked, so locking up matters. For an extra layer of security on a sliding glass door, a broom handle or a length of pipe cut to fit (many hardware stores will cut one to a measurement on the spot) placed in the track prevents the door from sliding open, while still allowing it to be left cracked slightly for airflow if the piece is cut a bit short.
Three Smart Hints for a Safer, More Efficient Home

A few small changes around the house can make a real difference to both safety and the monthly utility bill.
Secure a Sliding Door With a Broom Handle or Pipe
Buff Out Scratched Plates With Baking Soda
A paste of baking soda and water, rubbed into knife and fork scratches on dishware, makes scratched plates look new again.
Unplug Energy-Draining Appliances
Televisions, VCRs, toasters, coffeemakers, hair dryers, computers, printers, cable boxes, and phone chargers all draw power even when switched off, adding up to real money over a year. Plugging them into power strips that get switched off when not in use cuts off that drain entirely.
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This edition is part of the Genius House Hacks archive: 20+ years of tips, rebuilt from the original Handy Hints newsletter. Browse more hacks →