How 2 trace a laptop with its serial number



i've heard of it but i dont have the product key,
can you help me with, i'll be very grateful if you can get it for me. Thanks
 
And in case if someone breaks into your home, you can use a Kensington security cable to use on your Kensington lock hole (there's a hole with an icon that looks like a padlock with a K in it)