I'm here to learn C++ and *nix mostly, and am immensely indebted to this community for always being there when I get stuck. The help and support I've received on SE sites has allowed me to develop my understanding faster than I could ever have hoped for. I try to give back once in a while as well; it's the least I could do.
Q&A for professional and enthusiast programmers
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Q&A for computer enthusiasts and power users
Q&A for professional programmers interested in conceptual questions about software development
Q&A for finance professionals and academics
Q&A for people studying math at any level and professionals in related fields
Q&A for active researchers, academics and students of physics