I am an 'absolute beginer' to Linux. Should I start to learn Linux using Raspbian over Qemu or first try Debian / Ubuntu over my PC? What do you think?
Please give your opinions!
I'm totally new also and the only advice I can give you is to install something and get cracking. I tried the Oracle and Debian Squeeze image just to see how it all sort of works. There are lots of tutorials on the web, plenty of video tutorials on Youtube also. Reading, watching these tutorials and trying things out on your virtual machine is good.
The directory structure is different and hopping between the file manager on the Linux GUI and command line will help you navigate around your machine.
I also searched for "most useful Linux commands" and found many sites listing commands with basic interpretations. Remember that you can use man <any command>
to get a full "User Manual" for that particular command.
Once my Pi arrived, I had one of the usual newbie hurdles to tackle... wireless networking. Thankfully one of the video tutorials showed a text file being modified using nano, a built in text editor. It also showed how to use sudo nano to make superuser privileged changes to text files which allowed me to setup networking onto my wireless router.
Fixing problems like this is great teaching and as a total novice, plenty of reading or watching videos will help you to tackle this sort of problem.
Hope that helps