I think definitely life experiences lessons. The knowledge you gain from high school, a lot of it will be forgotten very soon, for example, I don't remember much, if at all what I learnt from my year 10 commerce classes, however, what has stuck with me to this date is the head teacher spending the majority of these lessons talking about life instead (yes at that time, I didn't appreciate it and thought it was just a waste of my time), but as I grown older and go through uni, those were probably the most valuable lessons I have learnt, about men needing to respect women, about pursuing your goals in life, about effort and how marks don't define who you are, about failures and successes, I truly wished we spend more time talking about these life stories and learning and discussing our own experiences, it really puts perspective on the whole journey and the few lessons I have had it has stuck with me to this date beyond the rigid confines of what's in the textbook.