This is my first post here, so I hope I'm in the right way and place to post my request.
Actually, I started to use linux ubuntu since one year ago due to completing a project, and from that time I got interested and glad of such experience and totally switched from windows to open source world But the point is that I'm learning linux just in the case my needs and looking for solution in the internet, and I never tried to read a book or reference. I'm even now responsible for a linux server in a small company, and you know I'm just doing tasks by searching and in few cases I already have the necessary knowledge.
So, to make a long story short, I ask you to introduce me a book or any kind of learning material to both gain some theoretical knowledge in linux and improve my practical knowledge more and more in details.
Thanks in advance,