Comment by bloodorange

It's hard to name just a single resource and some HN mates have already listed excellent resources. I'd like to add a little bit that perhaps someone will find useful: - Books by B. Stroustrup are excellent if you already know programming. I wish for a new edition of "The C++ Programming Language" to be honest. I learnt a lot of useful "tips" from many books but only by reading his books was I able to see why C++ made certain choices. That really helped me "level up".