Public network (Recommended). You should use this in most cases. Your PC will be hidden from other devices on the network. Therefore, you can’t use your PC for file and printer sharing.
Read moreShould I make my network private?
If you are referring to a network to which you are connected, a private network is safer as generally there will be much less opportunity for a hacker to reach your device . Since WiFi networks are generally private networks, connecting to such a network is generally safe from attack from the Internet.
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