Lesson 03 · Basics
A quick tour of what you can actually trade — and what those numbers like “the Dow” really mean.
“The market” is bigger than just single stocks. Here are the main things you’ll hear about, in plain terms.
Stocks
As covered in Lesson 1, a stock is a share of ownership in one company — like Apple or a tiny small-cap. Buy the stock and you’re betting on that single company. Most active traders, especially day traders, focus here because individual stocks can move fast.
ETFs (Exchange-Traded Funds)
An ETF is a basket of many investments bundled into one tradable share. Instead of buying one company, you buy a slice of a whole group at once.
- An ETF might hold hundreds of stocks — say, the 500 biggest U.S. companies.
- Why people like them: instant diversification and lower risk than a single stock.
- They trade all day just like a stock, so they’re easy to buy and sell.
Options
An option is a contract that gives you the right — but not the obligation — to buy or sell a stock at a set price before a set date. Options can multiply gains, but they can also expire worthless.
Beginner warning: options are powerful but risky and more complex than stocks. They’re worth understanding eventually, but most new traders should master plain stocks first.
Indexes: what “the Dow” actually means
An index isn’t something you buy directly — it’s a scoreboard that tracks a group of stocks to show how the market is doing overall. When the news says “the market was up today,” they usually mean an index rose. The three big U.S. ones:
- Dow Jones (the “Dow”): tracks 30 large, well-known U.S. companies. The oldest and most quoted.
- S&P 500: tracks 500 of the largest U.S. companies — widely seen as the best snapshot of the overall market.
- Nasdaq Composite: heavily weighted toward tech companies.
Traders watch these to gauge overall market sentiment. When the major indexes are strong and green, individual stocks tend to move more easily — useful context even if you only trade single names.
Putting it together
Stocks let you target one company. ETFs spread your bet. Options add leverage and complexity. Indexes tell you the mood of the whole market. Knowing the difference is what lets you choose the right tool for your strategy.
Ready to go deeper? Explore our trading tools and broker reviews to build your setup.
