This subject is somewhat related to an earlier post on prior context, but I like the metaphor, so here goes.
I am currently involved in an effort to get a team of young, eager developers to migrate to a new, object oriented technology stack. This exercise will be fraught with difficulties, apart from the obvious paradigm change (procedural to objects), there is also a new language and a 'better-practices' oriented way of working. My focus is really on encouraging learning from sources that I know and trust, in terms of books, blogs and pair programming with experienced folk who have already been there. In many respects I am fortunate to be working with enthusiastic people who want to change, but on the other hand, it really is mammoth task that I cannot do for them - they must find a way to do it for themselves with the support of others.
A while back I was trying to explain something and used the metaphor of a bridge, because helping people learn new things is never as simple as it seems, it is loaded with prior context, some good, some less so. It is impossible to bridge a large gap without building supports periodically along the way. Mentoring/teaching someone with a large gap in their knowledge of the history of computer science assumes very high expectations on the student and is also unfair. Recently I have realized that not only is it unfair, but it too is impossible. I find myself wanting to skip much of the knowledge I have gained over the years - to go straight from A-Z with these students, but I cannot. The span is too large. BTW - A-Z does not assume there is a specific endpoint or that I have reached one, I am merely referring to a learning process of 'just starting out' to 'knowing something useful'.
In my case, I learned a lot in the 90's with the whole OO boom including methodologies, notations and a bunch of other stuff, most of which I don't even think about now. That learning has helped me to understand how I do what I do now and without this, I don't think I could have bridged the gap personally. I guess my point is, without much of my earlier learning which provided my supports for the future, I don't how easy it would have been for me to bridge the knowledge gap.
Many good people in this business have taught many great ideas and some of the best are buried away in history, waiting to be rediscovered. For anyone serious about software, ignoring the past is perilous.