How do I start investing with little money?
The steps to start investing.

Section 1 · What a stock is

A stock is ownership in a company. When you buy one share of Apple, you own a tiny slice of Apple. If Apple earns money, your share is worth more. If Apple loses money, your share is worth less. If Apple goes bankrupt, shareholders are last in line after creditors and typically get nothing.

Apple has roughly 15 billion shares outstanding^[1]. Owning one share makes you a one-15-billionth owner of the company. That sounds trivial, and for voting power it is, but it is a real legal ownership claim on the company's assets and earnings.

Stocks go up over long periods because successful companies grow earnings. Stocks go down in the short term for thousands of reasons, interest rates, macroeconomic fear, missed quarterly expectations, war, pandemics. Nobody reliably predicts short-term moves. Everyone who tells you they do is either lying or mistaking luck for skill.

Section 2 · What a bond is

A bond is a loan. When you buy a government or corporate bond, you're lending the issuer money. They pay you interest (the "coupon") on a schedule, and return your principal when the bond matures.

Bonds are less risky than stocks in one important way: if the company goes bankrupt, bondholders get paid before stockholders. In exchange for lower risk, bondholders accept lower long-term return.

For beginners, the main thing to know: bonds generally drop in value when interest rates rise (the bonds you own pay less than newly issued ones) and rise when rates fall. See Bonds & Interest Rates: Why They Run Everything for how this works in markets.

Section 3 · Mutual funds vs ETFs

Instead of picking individual stocks, you can buy a basket of them in a single transaction. That basket is called a fund.

So the real difference is how you trade them, not who picks the stocks: an index mutual fund and an index ETF can hold the same market. Inside an IRA or 401(k) there is no tax difference between the two, per the SEC's Investor.gov bulletin on mutual funds and ETFs. The fee gap that matters is active versus index.

The fee difference matters enormously over decades. 1.0% vs 0.03% on $100,000 over 30 years at 7% real returns, the difference is roughly $180,000 of your money^[3]. The fund manager captures it in fees. Vanguard's Jack Bogle built a career on making this math visible.

Section 4 · Why index funds win

An index fund doesn't try to pick winners. It buys everything in the index (S&P 500, total U.S. Stock market, total world market) in proportion to market value. No active manager, no stock selection, no bet on which company will outperform.

You might think: surely a smart fund manager with a research team and Bloomberg terminals can beat a dumb index? The data says no.

If professional fund managers with teams of analysts and unlimited resources cannot reliably beat the index over decades, you almost certainly cannot either. This is not a knock on intelligence. It is a consequence of markets being roughly efficient, prices already reflect known information, so beating the average requires either genuine insight (rare) or getting lucky (unreliable).

The boring answer: buy the index. Pay 0.03%. Don't touch it for 30 years. You beat the overwhelming majority of professional managers without trying.

Section 5 · Compound interest is the entire game

At 7% real returns (roughly the long-run inflation-adjustedInflation-adjustedAdjusted for rising prices. Some amounts move with inflation, like IRS tax brackets, TIPS principal, or I-bond rates. Others are restated in today's dollars so different years can be compared: by the BLS consumer price index, $30,000 in 1985 bought about what $93,000 buys in 2026. U.S. Stock market), money doubles every ~10 years. $1,000 invested at age 25 becomes $16,000 by age 65. $1,000 invested at age 35 becomes $8,000 by age 65. Start 10 years later, end up with half as much.

Use the compound interest calculator with your own numbers. It is more convincing than any example I could write.

Section 6 · How to start (25 minutes)

1. Open a Fidelity account. Free, takes 10 minutes online, no minimums. Fidelity is a large U.S. Brokerage with good customer service and zero-fee trades.
2. Choose an IRA provider and account type only after checking eligibility, fees, investment options and near-term cash needs. For 2026, direct Roth IRA contributions phase out over modified adjusted gross income of $153,000–$168,000 for singles/heads of household and $242,000–$252,000 for married filing jointly. Other filing situations can differ. A backdoor conversion has separate tax and pro-rata issues; it is not an automatic tax-free workaround. See the detailed guide.^[5]
3. Set up an automatic monthly contribution. $100/month to start is fine. Raise it when you can. The automation is more important than the amount.
4. Buy FSKAX (Fidelity Total Market Index Fund). Expense ratio 0.015%, one of the cheapest in existence. Covers ~4,000 U.S. Companies in a single purchase. For full diversificationdiversificationSpreading investments across different assets so a drop in one doesn't devastate your entire portfolio.Full definition, add FTIHX (total international, 0.06%) and FXNAX (bonds, 0.025%).
5. Set it to auto-invest. Every month, Fidelity buys FSKAX for you automatically on the day you pick. Remove friction. Make saving the default.
6. Don't touch it for 30 years. This is the hardest part. Market down 30%? Don't sell. Market up 50%? Don't sell. Keep the automatic contributions running. Time in the market beats timing the market, every study, every decade.

That is it. That is the whole strategy. Most financial planning is this plus tax optimization, account selection, and specific situations. Start here. Add complexity only when it meaningfully improves your outcome.