The manpage ("man sox") has good examples and also in-depth info IMHO:
http://sox.sourceforge.net/sox.htmlThe thing with command-line programs is you have to read documentation before getting anything done, instead of stumbling around a GUI and hoping to get lucky
But I think the time investment is worth it in terms of repeatability and automatability, especially when you learn to script things.
What I don't recommend is blindly running things without understanding what they do, viruses spread that way.
Take your time, don't expect to be an expert overnight, but learn a little bit-by-bit. The basic principles of command-line programs and pipelines/filters (which sox both implements internally, as well as being able to use external filters/effects) goes well beyond sox or audio and can be generalized into any sort of stream processing (text/log files, traffic inspection/routing, tc).