Knowing What Would Have Saved My Younger Self

What’s one thing you know now that would have saved your younger self a lot of pain? I think there is a huge difference between information and knowledge.  My younger self was given information about what, who, where, and when. But at the same time I not given the how and why. Information at easy to store, copies, and share. Knowledge is a hard package copy because it lives inside a persons mind and habits. I think coupled with thinking that people not caring was the recipe for disaster.