My tips to those in your 20s & 30s, I can't stress this enough:
1. Avoid car loans
2. Avoid credit card debt
3. Build your credit score
4. Max out your Roth IRA
5. Take your 401k job match
6. Choose your friends wisely
7. Read more books, watch less TV
8. Invest at least 10% of your income
9. Build a 3-6 month emergency fund
10. Create at least two streams of income
11. Investing in yourself is crucial — don’t be cheap
12. Time is your most valuable asset — don’t waste it
What else?