Very vague question (as there are a lot of sub-disciplines of programming). But one thing I would advise (which I feel a lot of people skip) is learn some of t

Very vague question (as there are a lot of sub-disciplines of programming). But one thing I would advise (which I feel a lot of people skip) is learn some of the tools of the field in addition to the field. In particular know that at some point you need to know "development" and the main tools of that or source control systems, bug trackers, build systems and deployment systems.