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Stocks vs Bonds vs Index Funds

Investing · 13 min · Intermediate

The main investment types, explained without the Wall Street jargon. What to buy, what to avoid, and why one fund is enough for most beginners.

When you buy a share of stock, you own a tiny piece of that company. If Apple does well, your share is worth more. If Apple does poorly, your share is worth less.

When you buy a bond, you're lending money to a government, city, or company. They pay you interest for a set period, then return your principal.

An index fund holds hundreds or thousands of stocks at once, tracking a market index (like the S&P 500, which is the 500 largest U.S. companies).

Key takeaway: Stocks own pieces of companies. Bonds lend to them. Index funds let you own tiny pieces of hundreds at once. For beginners, a broad index fund is almost always the right answer.

Questions people ask

What's the difference between VTI and VOO?
VTI is the total U.S. stock market (~3,500 companies). VOO is just the S&P 500 (~500 largest U.S. companies). Both are excellent. They overlap heavily.
Should I diversify internationally?
Many advisors suggest 20-30% in international index funds (like VXUS) for additional diversification. Optional but reasonable.
What about target-date funds?
A target-date fund (like 'Vanguard 2065 Fund') automatically adjusts the stock/bond mix as you age. Easy 'set and forget' option for retirement accounts.
Is crypto worth including?
At most, 5–10% of your portfolio as speculation. Don't treat it as core investing — it's far more volatile than diversified stocks.
How do I know if a fund is 'bad'?
Expense ratio above ~0.50%, narrow concentration (one sector/country), or weird 'leveraged' structure. Stick with broad, cheap, simple.
Do dividends matter?
Reinvested dividends account for ~40% of long-term stock returns. Always enable DRIP (Dividend Reinvestment) in your brokerage.

Next in this path

  • Investing 101: Where to Start
  • Compound Interest: The 8th Wonder
  • How to Start Investing as a Minor
  • Open a Roth IRA, Step by Step