Part 2

What to Invest In

Chapter 6

What Are Stocks?

Pizza slices with company icons — stocks are pieces of companies

A stock is a tiny piece of a company. When you buy a stock, you own a small part of that business.

Think of a company like a pizza:

  • The whole pizza is the company
  • Each slice is a stock

If the company does well, your slice becomes more valuable. If the company struggles, your slice is worth less.

A pizza divided into slices representing stocks — each slice is a small piece of ownership in a company

The stock market

The stock market is where these slices are bought and sold.

Every day, millions of people buy and sell stocks based on news, expectations, and emotions. This is why prices bounce around all the time. In the short term, the market is noisy and unpredictable.

Stock prices zigzag wildly around the real value line — short-term movements are driven by emotions and news, not fundamentals

Stocks you already know

Stocks aren't some abstract financial thing. They represent real companies you use every day:

Apple, Amazon, Microsoft, Coca-Cola, McDonald's, Nike, Google...

When you buy a stock in Apple, you literally own a tiny piece of Apple. If Apple makes a lot of money, your piece becomes worth more.

Types of stocks

Not all stocks behave the same:

Tech stocks — Companies like Apple or Microsoft that build technology. They can grow fast, but their prices often jump around a lot.

Growth stocks — Companies like Tesla or Amazon (in its early days) that are focused on growing quickly. High potential, but also high risk.

Stable stocks — Older companies like Coca-Cola or Nestlé. They grow slowly, but are more predictable. They often pay dividends — small cash payments to investors.

Three types of stocks compared: Tech stocks (fast growth, wild ride), Growth stocks (big potential, big risk), and Stable stocks (slow and steady, pays dividends)

Why picking individual stocks is hard

Here's the problem: nobody knows the future.

Even great companies can struggle. And even if you pick the right industry, you might pick the wrong company.

Example: picking the AI winner

You know AI is going to be huge. So you try to pick the winner:

  • Nvidia — makes AI chips
  • Microsoft — makes AI software
  • Google — makes AI tools
  • Tesla — makes AI robots
Illustration showing the difficulty of picking a single winning stock out of many competing companies

But who will still be winning in 10 years? Who will make a fatal mistake? What new company might appear out of nowhere?

Even experts get this wrong constantly. That's why picking one stock is like putting all your money on one horse.

Key takeaway

Stocks are pieces of real companies. The stock market is where they're traded. Prices are hard to predict, and emotions make it even harder. This is why most smart investors don't try to pick winners. Instead, they buy many companies at once — using something called an ETF.