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The number one safest thing you can do if you have WiFi is to simply turn off File Sharing on all computers on the network. If you need to share some files, turn File Sharing on, move the files around, then turn it off again.
This will keep you safer than any other means of protection. The other methods (SSID, change router password, use WPA, etc) they are all good, but if you disable file sharing, your router will only be a conduit to the Internet.
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