Full answer
The order of operations matters enormously. Start with your 401k — at minimum, contribute enough to get the full employer match (free money, 50–100% instant return). Then pay off high-interest debt (anything above 6–7%). Then build a 3–6 month emergency fund in a high-yield savings account. Then fund your Roth IRA. Then maximize your 401k. Then invest in a taxable brokerage.
Index funds beat most active investors over the long term. An S&P 500 index fund (like Vanguard's VTSAX, Fidelity's FZROX, or the ETF version SPY/VOO) tracks the 500 largest US companies. Over any 20-year period, ~90% of actively managed funds underperform a simple index fund, primarily because of fees. Keep expense ratios under 0.10%.
Compound interest is the key to wealth building. $10,000 invested at 8% average annual return becomes $46,600 after 20 years and $100,600 after 30 years without adding a single dollar. Starting at 25 vs. starting at 35 can mean hundreds of thousands of dollars difference at retirement.
The Roth IRA is one of the most powerful wealth-building tools available. You contribute after-tax dollars, but all growth and withdrawals in retirement are completely tax-free. The 2024 contribution limit is $7,000/year ($8,000 if 50+). Open one at Fidelity, Vanguard, or Schwab — all have zero-fee accounts and commission-free trades.
Risk tolerance and time horizon determine your asset allocation. A simple rule: subtract your age from 110 to get your stock percentage (age 30 = 80% stocks, 20% bonds). Target-date retirement funds do this automatically and are a completely legitimate "set it and forget it" option. This is general educational information — consult a fee-only financial advisor (find one at NAPFA.org) before making investment decisions.