For example,
https://freelancing.stackexchange.com/questions/2540/which-skills-to-train
I can't really see that there is really any scope for proper answers for this question, since it seems to come down to common sense. "See what jobs are out there". Am I wrong? How are questions like this handled?
Even a list of what skills are in demand is not a great answer because it would be ever changing, opinion based and broad. My gut reaction is to close but I don't know if that's too harsh.