Well if I could just impart one idea or concept it would be similar to Feynman's quote: >“If, in some cataclysm, all of scientific knowledge were to be destroyed, and only one sentence passed on to the next generations of creatures, what statement would contain the most information in the fewest words? I believe it is the atomic hypothesis (or the atomic fact, or whatever you wish to call it) that all things are made…
All seem like reasonable bits of advice from a civilisation that let itself get wiped out,pretty much regardless of the cause.