Just got a Raspberry Pi ? Here you can get a pdf for 2 Euro which explains all the things you need to know for your first steps and much more.
Some say about the book that it just fills the gap for them because it concentrates on the knowledge you need for the Pi.
http://bitkistl.blogspot.co.at/2013/01/raspberry-pi-e-book.html
Regards,
Peter Bauer