Protect against Kali Lenux

I'm tech savvy enough to understand basic security things, but not enough to be confident in what I'm doing.

My step daughter has, on multiple occasions, gotten our wifi shut down for pirating stuff she's not supposed to and we have no more warnings left - one more time and we lose access to the only ISP available in our rural town. We've taken away her computer, but she keeps bringing stolen devices in regardless of punishment and police intervention. …

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