Save money so you're prepared for unforeseen circumstances. You should have at least three to six months of living expenses stashed in your rainy day savings account.
When faced with a choice of financing a purchase, it may be a better financial decision to choose a less expensive model of the same product and save or invest the difference.
Pay off credit card balances monthly.
If you must borrow, learn everything about the loan, including interest rate, fees and penalties for late payments or early repayment.
I really agree with these basic concepts here. If you're intending to go into investing to "make your fortune" then you had better have a lot of money backing yourself up because playing with money is never a sure thing! There are ways and methods you can implement to play safe and for that, you should really do your research before putting any actual finance down.