What is investing?
Investing is buying things like stocks, bonds and funds that may grow over years. Their value can also fall.
New to this?
Investing means buying something, like a small piece of a company, in the hope it grows in value over many years. If you have a retirement account at work, you already invest. Money in savings grows slowly. Investments can grow much more over time, but they can also lose value along the way.
Read first
Myth
You need a lot of money to start investing.
Truth
You can start with small amounts. $100 a month for 30 years, at an assumed 7% a year, could grow to about $121,997. Returns vary and can be negative, but the start can be small.
Worth memorizing
- 1
Save for soon, invest for years away.
Money needed within a few years stays in insured savings. Money for goals 10 or more years away can be invested.
- 2
Stocks are ownership, bonds are loans, funds are baskets.
A stock is a small piece of a company. A bond is a loan you make. A fund holds many of both.
- 3
Returns are never promised and can be negative.
In the example, a 20% drop turns Leo's $5,000 into $4,000. An assumed 7% a year is a guess, not a promise.
If you only do one thing, split your money into two piles: cash for anything you need in the next few years, and investments for the long haul. Then start the long-haul pile small. I'd rather see $25 a month invested than a perfect plan that never starts.
Do this today
Make two lists: money you will need within the next few years, and money you won't touch for 10 years or more. Only the second list is a fit for investing. Check that the first list sits in insured savings.
Practice
1 of 3
What do you own when you buy a share of stock?
A share is a tiny piece of ownership in a company. A loan to a company is a bond.
2 of 3
You invest $2,000 and its value falls 15%. What is it worth now?
$2,000 × 15% = $300 lost, and $2,000 − $300 = $1,700.
3 of 3
Which money is the best fit for investing?
Only the retirement money has decades to ride out drops. The others are needed soon and belong in insured savings.
Tips
Build a starter emergency fund first
Keep some cash in savings for surprises before you invest. Otherwise a car repair could force you to sell investments at a bad time or reach for a credit card.
Match the money to the date
Write down when you will need each pot of money. A few years or less goes in savings. Ten years or more, like retirement, can be invested.
Start small and keep going
Even $25 or $50 a month is a real start. Steady deposits over many years matter more than a big first amount.
Plan for drops before they happen
Prices can fall 20% or more in a bad year. Decide now that you will keep holding long-term money through a drop instead of selling.
A worked example: short-term money vs long-term money
Leo, 27, has $5,000 saved for a car he will buy next year. He also wants to invest $100 a month for retirement for 30 years. All returns here are assumptions.
- If the car money were invested and prices fell 20%, $5,000 × 20% = $1,000 would be gone. Leo would have $4,000 when he needs $5,000. So it stays in savings.
- For retirement, 30 years × 12 = 360 deposits of $100, or $36,000.
- At an assumed 7% a year, compounded monthly, that could grow to about $121,997. Real returns vary, and some years are negative.
- Car money, if invested$5,000
- Assumed 20% drop−$1,000
- Left when the car is due=$4,000
- Assumed yearly return7%
- You put in: 360 × $100$36,000
- Assumed growth over 30 years+$85,997
- Balance after 30 years=$121,997
Try your numbers
Reference
$100 a month at an assumed 7% a year (real returns vary and can be negative)
| Year | You put in | Growth | Balance |
|---|---|---|---|
| 1 | $1,200 | $39 | $1,239 |
| 5 | $6,000 | $1,159 | $7,159 |
| 10 | $12,000 | $5,308 | $17,308 |
| 15 | $18,000 | $13,696 | $31,696 |
| 20 | $24,000 | $28,093 | $52,093 |
| 25 | $30,000 | $51,007 | $81,007 |
| 30 | $36,000 | $85,997 | $121,997 |
Common mistakes
Investing your emergency fund
A market drop can arrive at the same time as a job loss. Keep emergency money in insured savings so it is all there when you need it.
Putting everything in one company
If that one company struggles, your whole investment struggles with it. A fund spreads your money across many companies, so one failure hurts much less.
Selling in a panic after a drop
Prices that fall can recover, but only for people who still own the investment. Selling during a drop turns a loss on paper into a real one.
Going deeper
Investing means putting money into things like stocks, bonds and funds that may grow in value over many years. The value can go down as well as up, so investing is for money you won't need for a long time.
Saving and investing do different jobs
Money in an insured bank account keeps its value and is easy to reach. Investments can grow more over long periods, but their value moves up and down along the way.
A stock is a small piece of a company
Owning a share means you own a tiny part of that business. If the company does well, the share may rise in value. If it struggles, the share can fall, sometimes to zero.
A bond is a loan you make
You lend money to a company or a government, which promises to pay you interest and repay the loan on a set date. Bonds usually swing less than stocks and grow less.
A fund is a basket
A fund pools money from many people and buys many stocks, bonds or both. One share of a fund spreads your money across all of them, so one failure hurts less.
How saving and investing differ
Saving means keeping money somewhere safe, like a savings account at a bank or credit union. Insured accounts keep their value, so $1,000 today is still $1,000 next year, plus a little interest. The trade-off is slow growth.
Investing means buying something whose value can change, in the hope that it grows. Over long stretches, investments can grow faster than savings, but there can be years when they lose money.
What a stock is
A company can be split into millions of small pieces called shares, or stock. When you buy a share, you own a tiny part of that company.
If the company earns more over time, people may pay more for its shares. If the company does badly, the price falls, and if it fails, the shares can become worthless.
What a bond is
A bond is a loan you make to a company or a government. In return, the borrower promises to pay you interest on a schedule and to pay back the full amount on a set date.
Bonds usually move up and down less than stocks, and they usually grow less too. They still carry risk. A borrower can fail to pay, and a bond's price can drop if interest rates rise before you sell it.
What a fund is
Putting all your money in one company is risky. A fund pools money from many investors and buys a basket of many stocks, bonds or both. One share of the fund gives you a small slice of everything in the basket.
Funds charge a yearly fee, shown as a percentage called the expense ratio. Index funds, a low-cost type that follows a whole market, get their own lesson later.
Risk and time horizon
Risk here means how far, and how often, the value can drop. Your time horizon is how long until you need the money. A short time horizon leaves no room to wait out a drop.
So the same investment can be sensible for one goal and a poor fit for another. Retirement money for a 27-year-old has decades to recover. A house down payment due next year does not.
Why money you need soon stays in savings
Prices can fall sharply and sometimes take years to come back. If you need the money during a drop, you have to sell at the low price, and the loss becomes real. A common rule of thumb is to keep money you need within about 3 to 5 years in insured savings.
That includes your emergency fund, money for bills and short goals like a car or a wedding.
Returns are assumptions
When an example says "assume 7% a year", that is a guess for the math, not a promise. Real returns change every year, some years are negative, and nobody can tell you which in advance.
Questions people ask
How much money do I need to start investing?
Not much. Many accounts have no minimum, and many funds let you buy part of a share, so you can start with $25 or $50. The lesson on how to start investing walks through the steps.
Can you lose money investing?
Yes. Any investment can fall, and one company's stock can go to zero. A broad fund spreads the risk, but it can still drop a lot for months or years.
Should I pay off debt before investing?
High-interest debt, like credit cards, usually comes first, because paying it off saves a known rate of 20% or more. A common exception is an employer match on a workplace retirement plan, covered in its own lesson.
Is money in an investment account insured like a bank account?
No. Bank deposit insurance covers savings and checking accounts, not stocks, bonds or funds. A separate protection called SIPC can help if the investment firm itself fails, but it does not cover losses when prices fall.
Printable worksheet with answer key, free for classrooms. Lesson plan for this unit.
Sources
- Investor.gov (SEC): Introduction to investing
- Investor.gov: Stocks
- Investor.gov: Bonds
- FINRA: Investing basics
Updated October 1, 2026. General education, not personalized financial, tax or legal advice. Figures are examples. Check current rates and limits before you act.
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