Your home network is as safe as your router, your router password, and your wireless password. Make sure your router is updated with the latest firmware, and make sure you have a fairly complex password for your wireless network. Make sure you have a tougher password for your router. A hacker has to be nearby to crack your wireless network, but dictionary attacks on your router can come from anywhere in the world. If a bad guy gets in, you could find your computer is an internet host for malware, illegal software, or worse.