It is jut a bad idea all round really. If an unauthorised user connects to your network, they may visit illegal websites or commit illegal activity which will be traced back to you. You may also have some shared folders that you didn't know you had. These can generally be accessed by anyone on the network. If permissions on these folders are set to read/write then the unauthorised user may be able to delete any shared files.
If you do not set password for your wireless network you will get unsecured network. If you mean that you want use your router to connect to another unsecured wireless network and create so called "bridge" the answer is yes. But! Router from different manufactures usually do not work together in the bridge configuration. There are some exceptions but just few.
It wireless network settings choose "do not broadcast SSID", activate security for wireless networks. It's better for you if use WPA at least.
File and Printer Sharing allows other computers on a network to access resources on one's own computer. In a closed network this can help productivity, however it is not recommended to make use of this feature in an unsecured network to prevent data abuse.
If you use a network at all in a home situation then a LAN is common.
No, they do not live in chimneys but might use an unsecured chimney as a way to gain entrance to a home.
It is safer using PSN than most sites that we do use.
A home network camera is a camera that they would have in stores. Home network cameras are basically security or surveillance cameras to protect yourself.
I always make sure to lock the door to keep my valuables safe when I leave the house.
no
no it might explode
true
Credit cards are unsecured debt. If use your home to back up the Credit line. Yes they can.