before you blow a lot of money on books, remember that there are forums and communities on pretty much any flavor of linux. if you want to do something in particular and you're running into issues you can learn a lot and solve your own issues with a little google-fu.
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[ 2.8 ms ] story [ 12.7 ms ] threadanyway here are some (good) reads:
to start: https://www.amazon.com/gp/aw/d/1593273894/ref=mp_s_a_1_1?ie=...
to get better: https://www.amazon.com/gp/aw/d/1593275676/ref=mp_s_a_1_3?ie=...
security: https://www.amazon.com/gp/aw/d/1590594444/ref=mp_s_a_1_4?ie=...
networking: https://www.amazon.com/gp/aw/d/0596002556/ref=mp_s_a_1_1?ie=...
basic h4x skills: https://www.amazon.com/gp/aw/d/1491944331/ref=mp_s_a_1_3?ie=...