Wireless networks are unsafe.
This myth tells you that wireless networks can be easy hacked. The most secure method to work on computer is not connect to the Internet and other networks, don't plug any external device and better do not run any executable files. But we all know this is a suspicion. In fact, any wireless connection is less secure than a wired one. But if you will use strong encryption level it can be secure much like a wired network. Nowadays all common wireless devices support one of the encryption protocols: WEP, WPA and WPA2. You can use one of them to feel your self safely. WPA2 is considered the most secure among others.