Documentation on Linux is not that good really. Man pages can be useful if you can understand them - they seem to be written in a language known only to their writers as far as I can tell.
The rute guide might be of some interest to you: http://rute.2038bug.com/index.html.gz
but really it is just a case of picking it up as you go along. Even Linux magazines are 90% crap.
The world definitely needs a Linux magazine written for users and not sysadmins. Linux is big enough to cope with that now, but the powers that be in the press world don't believe it, so won't do it. The first person that actually does do it will get a very pleasant surprise in my opinion and the others will all be out of a job.
Fujitsu Lifebook AH532. Intel i5 processor, 6Gb ram, Intel HD3000 graphics, Intel Audio/wifi. Realtek RTL8111/8168B Ethernet.Lubuntu 13.10,Ubuntu12.10 (Unity), Mint16 (Cinnamon), Manjaro (Xfce).