"If you only knew then what I know now..." I've been hearing this statement a lot lately (mostly from old people). I've been thinking about it lately and there's really not too many decisions I wish I didn't make in my past experiences. Yes, there's the obvious stock or investment that I shouldn't have bought in and the occasional girl I should have asked out. However, I'm in my mid 20's and consider myself rather ignorant when it comes to life's lessons. Anyways, I thought it would make a neat thread to hear what some of you more "experienced" folks on PF would say to younger versions of yourselves given the chance and a time machine. Any special words of wisdom other than "buy low, sell high"?