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Financial foundations come before investing. The biggest mistake new investors make isn't picking the wrong stocks - it's investing money they can't afford to lose. Without an emergency fund, a single unexpected expense can force you to sell investments at a loss, wiping out years of gains.

Your emergency fund is your safety net. Three to six months of essential expenses, kept in a high-yield savings account, protects you from life's curveballs. This money isn't earning much, but that's not its job - its job is to keep you from going into debt or liquidating investments when emergencies happen.

Not all debt is created equal. High-interest debt (credit cards, payday loans) should be eliminated before investing. The guaranteed "return" of avoiding 20%+ interest beats any stock market gains. But low-interest debt like mortgages can coexist with investing - the math works in your favor.

There's one exception to every rule: employer matching. If your employer offers a 401(k) match, contribute enough to get it - even while paying off debt. That's an instant 50-100% return you won't find anywhere else. Then attack your high-interest debt aggressively before investing more.