nothing is exposed publicly except a VPN. no key, no service. (edit: firewall rules only activate on special request from an app on my phone. via software I wrote that polls specific values with specific signatures)
VPN drops you to a vlan that only has app access through reverse proxies.
all network traffic is monitored and alerted using graylog. same for system logs as well.
all alerts notify me directly. all WiFi is whitelist only.
why so strict? mostly because I'm paranoid. I had a stalker earlier in my life that made me fully appreciate privacy.