I'm living with some roomies that I sort of know and occasionally I use their internet. I'm pretty computer savvy but know very little about networks. None of them are too computer savvy and I have reason to believe that at least one of them probably visits malicious or even illegal websites, although I can't prove it.
What can I do to keep my own computer safe and protect my own legal status? I only use the network for looking up programming documentation and downloading linux packages, all of which I can do elsewhere if I have to. Am I at risk from whatever they do? What's the best play here?