Explanation of a bash command

Hi /prog/,

Can you explain this command for me
for f in *.lib; do mv $f lib${f%%lib}a; done

nr 13 here again

Yeah I definitely want to learn to use Linux, but that shit is hard when you're used to doing other stuff. I started out on my fathers computer, and he ran MS OS's exclusively, so that's what I've gotten used to. I do, however, have *two* machines to work on, so I'm going to turn one of them into a linux box and use that one primarily until I get it.

Are there some good resources on Linux, like some 101 stuff along the lines of "If you wanted to do THIS in Windows, you do it like THIS in Linux (or you don't do it in linux because Bad Practice).

My latest problem was that I was trying to install a restricted program which I couldn't get through apt-get, and I have bollocks for idea how to do that on Linux. It had an installer file which I could run as root, but I had no idea where to put it, because I couldn't access /opt which is where I suspect it's *supposed* to go.