Please give me some advise to program for unix/linux using c/c++?

I have a good foundation of c++.I want to learn to program for linux/unix,can you give me some advises,for example classic books ,which operating system is used better(freebsd,solaris,federal linux.etc),and which aspects uses mostly in job.Can you give me clear direction for working or learning.

Advanced programming in the UNIX environment( second edition)