some of my favourite No Starch Press books:
* Hacking: The Art of Exploitation (where I learned about ARP!) https://nostarch.com/hacking2.htm
* the legendary "The Linux Programming Interface" https://nostarch.com/tlpi (where I learned that I'd misunderstood how users and groups work in Linux!)
* Ruby Under a Microscope (which was very helpful when I was writing a Ruby profiler) https://nostarch.com/rum
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