The Free Technology Academy has recently released a free ebook titled GNU/Linux Advanced Administration which aims to cover almost all aspects of managing a Linux installation. Linux need a lot of knowledge (in my opinion) to make it working in the right way and with security, specially if you are using it as web server.
This guide on Linux administration can be a great resource to learn how Linux work and how to administer it.
Read it here.
Via: n2h.it.
