Dongle Hack How Do I Make My Laptop?

How do I make my laptop? - dongle hack

safe from hackers? I'm going to buy a laptop with a wireless adapter and want to make sure that the people can not cut. I'm going to the firewall and antivirus, but I've heard horror stories of people with hotel / WiFi cafe and the people in the rooms nearby, you can access your system. In simple words, to make as safe, or with the dongle and use of public WiFi?