Make a budget and actually stick to it. Boring advice, I know, but it works. The envelope method helped my family — cash in labeled envelopes for groceries, gas, fun money. When the envelope is empty, you're done spending in that category.

If your employer offers a 401k match, contribute at LEAST enough to get the full match. That's free money — like a 100% instant return. Skipping the match is leaving thousands of dollars on the table every single year. Do that before anything else.

I made this exact mistake when I was younger and it cost me. Learn from others instead of learning the hard way. The personal finance section of any bookstore has dozens of books — they mostly say the same sensible things for a reason.

Taxes are the part everyone forgets about. Whatever you're planning, factor in what you'll owe Uncle Sam. Talk to an accountant — a good one saves you more than they charge. H&R Block is fine for simple stuff but get a real CPA if it's complicated.

Get a free copy of your credit report once a year from annualcreditreport.com — the real free one, not those 'free' sites with monthly fees. Check it for errors. Mistakes on credit reports are way more common than people realize.