Prospective investors carry too much credit card debt.  This mistake is a corollary of Mistake #1.  Stay out of credit card (CC) debt.  Mistake #2 is not so much an investor mistake, but rather a mistake of bad management as it has nothing to do with managing a portfolio.  If

Mistake number one in my book is failure to save or to not follow The Golden Rule of Investing.  Open up a spreadsheet and run your own calculations for the following classic comparison. As a nineteen year old you have the foresight and financial opportunity to save $2,000 per year