1. Read. Read every day. Fact, fiction, newspapers, magazines...read for at least half an hour every day. You will learn stuff and engage your mind. Don't have the time? You just think you don't have the time. Spend 30 minutes less watching TV or on facebook. Note: TV Guide, comments sections, and tweets do not count.
2. Learn to cook. Pathetic and unhealthy is the man (or woman) who moves into their own place and now must subsist on delivery or microwave meals. Get some cookbooks and quality ingredients and learn how to make at least one of each of the following: A quick dinner, a filling, healthy dinner (that you can have leftovers of for dinner the next day), something to bring to a party/potluck, something to impress a special someone you have invited over. Then, learn how to make many different dishes in each category.
3. Nothing ever really changes. Think back to elementary school. The little awkward nerd grows up to be a big awkward nerd. The little self-absorbed drama queen grows up to be a big self-absorbed drama queen. The little bully grows up to be a big bully. The problems and thoughts and feelings and fears you had as a kid will be the problems and thoughts and feelings and fears you have as an adult. The things that worry or frighten or amuse you are the same things that did the same to your parents, and their parents, and their parents and so on. This isn't good or bad, it just is.
4. Don't bother seeking revenge. You got your own things to worry about. Someone cheated you out of love, money, prestige, possessions? You have other things to worry about. Keeping your wheels spinning is hard enough, without going out of your way to make someone else miserable. Learn from your mistakes, accept it, and move on.
5. The world is a crazy, messed-up, beautiful place. It is what it is, which is to say it is what you make of it.