Getting on the US-CERT mailing list means that you sometimes get a set of good tips (and also that you get reminders when Microsoft pushes out their monthly set of patches). Right now, they’re sharing a set of security tips around home networking, such as the dryly-titled “Security Tip (ST15-002): Securing Your Home Network“.
The title is dry but the content is important for any home. Check it out for tips on setting up your router for a good baseline level of security, to keep people from using your network without your permission and to keep people from spying on your Internet usage.
To sign up for future security tips and alerts from the US-CERT, scroll to the bottom of the security tip page and drop in your email address. It’s been invaluable to me!