Basics of Stock Investing: A Plain-English Guide for Absolute Beginners

A note on authorship: The research, analysis, and opinions in this article are the author's own. Claude (Anthropic's AI) assisted with drafting and editing the prose.

This is the first article in our Stock Market Basics series. If you've ever heard people talk about "the stock market" and wondered what any of it actually means, this is where to start. No jargon, no assumptions — just the fundamentals, explained with simple examples and round numbers.

What is a company?

A company is a business. It makes something, sells something, or provides a service — and it charges money for it. A coffee shop, a car manufacturer, an airline, a bank, a tech company that builds software: all companies.

Every company has the same basic goal: earn more money than it spends. The money it brings in from customers is called revenue. The money it spends to operate — rent, salaries, materials, electricity — are its costs. What's left over after paying all the costs is the company's profit.

That's it. A company is a machine that tries to turn revenue into profit. Some do it well, some don't. The ones that do it consistently tend to grow over time.

Who owns a company?

Every company is owned by someone. A small bakery might be owned by one person. A tech startup might be owned by two founders and a handful of early investors who put money in to help it grow.

When a company is small and owned by a handful of people, it's called a private company. You can't just walk up and buy a piece of it — ownership is limited to the people who started it or were invited in.

But what happens when a company wants to raise a lot of money to grow — more than its founders or a few investors can provide? It can go public.

What does "going public" mean?

Going public means the company divides itself into thousands (or millions) of small, equal pieces and sells those pieces to anyone who wants to buy one. Each piece is called a share. The event itself is called an IPO — an Initial Public Offering.

Once a company goes public, its shares are listed on a stock exchange — a marketplace where people buy and sell shares. In the United States, the two biggest exchanges are the New York Stock Exchange (NYSE) and NASDAQ. In Australia, it's the ASX. In Japan, the Tokyo Stock Exchange. Every major country has at least one.

After the IPO, you don't buy shares from the company directly — you buy them from other people who already own them, and sell to people who want them. The stock exchange is where that happens, and it's open during business hours on weekdays.

What is a share of stock?

A share is a tiny piece of ownership in a company. If a company has 1,000 shares in total and you own 10 of them, you own 1% of that company — 1% of its profits, 1% of its assets, 1% of everything it's worth.

Let's use a simple example with round numbers.

Imagine you and four friends want to open a coffee shop. You each put in $10,000, for a total of $50,000. You decide the shop is split into 100 shares, so each of you gets 20 shares.

Each share is worth $500 ($50,000 ÷ 100 shares). That $500 is the share's price — but it won't stay at $500 forever. If the coffee shop does well and becomes more valuable, each share will be worth more. If it struggles, each share will be worth less.

What is the aim of a company?

The short answer: to make money for its owners.

A company's owners are its shareholders — the people who hold its shares. When the company earns a profit, that profit belongs to the shareholders. The company can do two things with it:

• Keep it — reinvest the profit back into the business to grow (hire more people, open new locations, build new products). This is called retained earnings.
• Pay it out — send some of the profit directly to shareholders as cash. This is called a dividend.

Most companies do a bit of both. A young, fast-growing company (think early Amazon or Tesla) usually keeps all its profits to fuel growth. A mature, stable company (think Coca-Cola or Johnson & Johnson) often pays a regular dividend because it doesn't need every dollar for growth.

How do you make money from stocks?

There are exactly two ways.

1. The share price goes up (capital gains)

Back to the coffee shop. A year later, business is booming. Revenue is strong, profit is growing, and the shop is now worth $100,000 instead of the original $50,000. Your 20 shares are now worth $1,000 each — double what you paid.

If you sell your shares at $1,000 each, you pocket $20,000 — a $10,000 profit on your original $10,000 investment. That $10,000 profit is your capital gain.

Of course, the opposite can happen too. If the coffee shop struggles and is only worth $30,000 after a year, your shares drop to $300 each and your 20 shares are worth just $6,000 — a $4,000 loss. You only lock in the loss if you sell. If you hold on and the business recovers, the price can recover too.

2. The company pays you cash (dividends)

Suppose the coffee shop earns $20,000 in profit this year and the five owners vote to pay out half of it — $10,000 — as a dividend. The other half stays in the business.

You get $2,000 in cash, deposited straight into your account — and you still own all 20 shares. If the company keeps earning profits and keeps paying dividends, you keep receiving cash every year without selling anything.

This is why some investors love dividend-paying stocks: they provide a regular income stream, almost like rent from a property, except your "property" is a piece of a business.

What about the risk?

Everything above describes what happens when things go well. They don't always. A company's sales can slow, a competitor can take market share, or the broader economy can weaken — and when that happens, the share price falls. Days, weeks, even months where prices drop are a completely normal part of owning stocks, not a sign that something has gone wrong with the system itself.

The coffee shop example already showed the mechanism: if the business struggles, your shares are worth less on paper, and that only becomes a real loss if you sell while the price is down. Historically, the stock market as a whole has recovered from its downturns over long enough periods — but no single company is guaranteed to.

That's why most investors don't put all their money into one company. Diversification — spreading your money across many different companies, industries, or a single fund that holds hundreds of companies at once — means a bad year for one business doesn't sink your whole portfolio. It won't shield you from a bad day across the whole market, but it does protect you from betting everything on one company's fortunes.

Real companies work the same way — just bigger

Everything above applies to companies listed on the stock exchange. The only difference is scale.

Apple has about 15 billion shares outstanding. If Apple's entire business is worth $3 trillion, each share is worth about $200 ($3 trillion ÷ 15 billion shares). That total figure — a company's whole value, found by multiplying shares outstanding by the share price — has a name: market capitalisation, or "market cap" for short. It's the same idea as the coffee shop's $50,000 total value from earlier, just at a much bigger scale, and it's the number you'll see on every stock screener and ticker page, right alongside the share price. If you buy 10 shares for $2,000, you own a real (though very small) piece of a company that designs iPhones, runs the App Store, and earns over $90 billion a year in profit.

When Apple has a good quarter and investors think the company is worth more, the share price rises. When it reports disappointing results, the share price falls. Apple also pays a dividend — about $1.00 per share per quarter — so those 10 shares would earn you roughly $40 a year in cash, on top of any price movement.

That's all a stock is: a piece of a real business. The price moves because millions of people are constantly reassessing what that business is worth — based on how much profit it makes, how fast it's growing, and what they expect to happen next.

Three things to remember

1. A share = a piece of a business. When you buy a stock, you're not gambling on a number going up — you're buying a slice of a company that sells real products, employs real people, and earns real money.
2. There are two ways to profit: the price going up (capital gains), and cash payouts from profits (dividends). Many investors benefit from both.
3. Prices move every day — that's normal. Over short periods, stock prices bounce around based on news, mood, and speculation. Over long periods, they tend to follow the actual performance of the business.

What's next

This is Part 1 of our Stock Market Basics series. In Part 2: What Is a Company Actually Worth?, we go deeper on what sits behind a stock's price — what a company owns and earns, how that compares with its market cap, and why investors often pay far more (or less) than the business owns, with Toyota and Ferrari as real examples.

If any of the concepts above feel new, that's exactly where you should be — everyone starts here. The rest of the series will build on this foundation, one piece at a time.