I think you learn the fastest when you are making decisions and experiencing outcomes that matter to you. In that sense mentor's can provide specific decision-o

I think you learn the fastest when you are making decisions and experiencing outcomes that matter to you. In that sense mentor's can provide specific decision-oriented advice that is "just in time." But to be able to appreciate the context, and to save a lot of time, it seems to me that a significant amount of both technical and business/entrepreneurship reading is critical (or perhaps necessary but not sufficient).