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It’s very easy once you gain access to someone’s WiFi network to actually get all of the information off your computer like banking info, credit cards and CVN’s, Browser History and passwords etc… Someone can even install a keylogger on your computer without you knowing that records every keystroke you make.
When you setup your WiFi at home you will need to choose your encryption method. Most people do not know what the difference is between them and they just randomly click on one that sounds like they heard it from the movie Tron or the Matrix... Without getting into the techie details that will not likely help you decide Keep the following 4 points in mind.
You will also need to choose an SSID. The SSID is what gets broadcasted into the air, so you probably shouldn’t use your kids names, or your name or anything that might reveal your password when you choose your SSID. Actually to be honest, my SSID at home is OPP-RemoteOfffice6. (Where I live OPP is the local Police Department) Why would I choose that? Well who in their right mind would try and crack into a Police stations WiFi? I have no idea if there are laws around what you call your wifi hotspot, but it seemed logical to me a few years ago, and still makes sense to me now so it has just stuck for me. Whenever I setup a relative's or friend's wifi hotspot that is what I pick for them.
If you choose a good password for your WPA2 wifi network and do the other things like install/enable a local Firewall, Virus and Malware programmes you should be relativly secure. Of course times change and things continually get hacked so be aware.