Most hackers are looking for exactly what you have: unsecured Wi-Fi networks! Hacking, though a black-hat technique, is simply an art that miscreants die to master.
Much to the delight of a professional hacker (I would rather that this is an Oxymoron), a common man easily falls into his trap. But fortunately for the common man, quite pleasantly surprisingly, there is a much easier way out of this predicament. Read on and do not stop short of just being amazed; put them to work. I am giving you exactly 4 techniques.
Technique 1: You do have a Name of your own, don't you?
SSID is your network identifier. Never leave your default SSID intact; change it as soon as possible by following the below steps.
a. Type http192.168.1.1 (usually)
b. Enter the default ID and password in the main login page (you may Google the default user id and password for virtually all network service providers).
c. Go to Wireless -> Basic
d. Check on the Enable Wireless option e. Change your SSID to something that is difficult for others to guess.
Technique 2: The amazing Wall of Fire that blocks bugs.
If your network supports Firewalls, please make sure that you use it. There are several protocols and it is usually a complicated procedure for a newbie to set up but your service provider would be only glad to help you out. Well, if they are not, you see, it's a wide world!
Technique 3: You jumble; hackers fumble!
This technique talks about encryption standards; in a way, a sort of jumble.
a. Type http192.168.1.1 (usually)
b. Enter the default ID and password in the main login page (you may Google the default user id and password for virtually all network service providers).
c. Go to Wireless -> Security and select "WPA2-PSK" from the Network Authentication drop-down box.
d. Enter your chosen password in the box labeled WPA Pre-shared key. Make sure that the password is extremely difficult to guess. Example: Try something like HLL0WeeN2000
Technique 4: Thieves thrive in crowds of people.
a. Type http192.168.1.1 (usually)
b. Enter the default ID and password in the main login page (you may Google the default user id and password for virtually all network service providers).
c. Go to Wireless -> Basic and select as less a number as possible in the box labeled "Max Clients".
All in all, remember this golden sentence: "Jumbled Names of People on the Wall"
Disclaimer: This article best serves as a set of useful tips and is not intended to replace professional advice, especially in sensitive and technologically advanced topics such as network security. Get in touch with professionals before making a choice.