Unplug electronics when not in use to prevent phantom load
Most electronics consume electricity even when turned off. Computers, microwaves, sound systems, chargers etc. together use more electricity than your refrigerator. Why let your electronics waste electricity?
Plug electronics into a power bar, and switch off the power bar when electronics are turned off. Or use a Smart power bar, which will automatically turn off peripherals (DVD, speakers etc) when the main unit (TV) is off.