I am teaching a class of college seniors next semester. I would like cover some "get ready for life" kind of things as we go through the semester. Here's where I need your help. What things do you know now (as a... ahem... mature adult) that you wish you had known or understood as a 20-something year old? It can be anything from financial advice to personal to professional. What would you tell this generation as they get ready to enter the workforce?