Step 1 :
Be sure to change the administrator login and password of your Wi-Fi network access point/ router to a combination that only you know.
Step 2 :
Give your network name (often called SSID) something unique and easily identifiable, but make sure that the name does not contain any personal information. Hide your network name as an additional safety measure.
Step 3 :
Encrypt your communications by enabling the highest security encryption i.e. Wi-Fi Protective Access Version 2/ WPA2 which requires the use of a password before users can access your Wi-Fi network.
Step 4 :
Ensure that the user password to your Wi-Fi network is different from that used for the access point/ router network administrator.
Step 5 :
Use a password that is difficult to guess, with at least 20 characters long, and change it often.
Step 6 :
Always monitor who is using your Wi-Fi network. As the network administrator you may also determine the list of computers (through its MAC address) that can access your network.