“If you don’t want to provide people access to your Mac, you should shut any doors that provide it,” Breen writes. “To start, go to System Preferences > Sharing and turn off any sharing options you have enabled — file sharing and screen sharing, for example.”
“Or you could forego this Wi-Fi connection entirely and instead use another hotspot,” Breen writes. “Your iPhone could be just the thing if you’ve paid for a tethering plan. Yosemite’s Instant Hotspot feature makes this really easy.”
More tips for securing your data in public in the full article – recommended – here.
