What Is Trading

Difficulty beginner

Definition

Trading is the act of buying and selling financial instruments with the objective of generating profit from price movements. Unlike investing, which typically involves long-term holding based on fundamental value, trading focuses on shorter-term price action and market inefficiencies.

Trading vs. Investing

Aspect	Trading	Investing
Time Horizon	Seconds to months	Years to decades
Analysis Method	Technical, quantitative, sentiment	Fundamental, valuation
Turnover	High	Low
Goal	Capital gains from price changes	Wealth accumulation, dividends
Risk Profile	Active risk management	Buy and hold tolerance
Tax Treatment	Short-term capital gains	Long-term capital gains

Types of Trading

By Timeframe

Type	Holding Period	Capital Required	Stress Level
Scalping	Seconds to minutes	Low-Medium	Very High
Day Trading	Minutes to hours (close flat daily)	Medium	High
Swing Trading	Days to weeks	Medium	Medium
Position Trading	Weeks to months	Medium-High	Low-Medium
Algorithmic	Milliseconds to days	Varies	Low (automated)

By Strategy

Strategy	Description	Market Condition
Trend Following	Ride directional moves	Trending markets
Mean Reversion	Bet on return to average	Ranging markets
Arbitrage	Exploit price discrepancies	Any market
Market Making	Provide liquidity	Any market
Momentum	Buy winners, sell losers	Strong trends
Breakout	Trade range breaks	Consolidation ending
News/Event	Trade on information catalysts	Event-driven

Key Participants

1. Retail Traders — Individual traders using personal capital
2. Institutional Traders — Professionals managing institutional money (pension funds, mutual funds, hedge funds)
3. Market Makers — Firms providing continuous bid/ask quotes
4. High-Frequency Traders — Algorithmic firms trading at microsecond speeds
5. Proprietary Traders — Trading firm's own capital
6. Arbitrageurs — Exploiting price inefficiencies across venues
7. Central Banks — Influencing currency and interest rate markets
8. Corporations — Hedging operational risks

Market Hours (EST)

Market	Pre-Market	Regular	After-Hours
US Equities	4:00 AM	9:30 AM - 4:00 PM	4:00 PM - 8:00 PM
US Futures	6:00 PM (prev day)	—	—
Forex	24/5	—	—
Crypto	24/7	—	—

The Trading Process

Research → Strategy Design → Backtesting → Paper Trading → Live Trading → Monitoring → Optimization

1. Research — Study markets, identify opportunities
2. Strategy Design — Define entry/exit rules, risk parameters
3. Backtesting — Test strategy on historical data
4. Paper Trading — Simulate with real-time data
5. Live Trading — Deploy with real capital (start small)
6. Monitoring — Track performance, detect regime changes
7. Optimization — Refine parameters, adapt to conditions

Core Principles

1. Risk First

Protect capital before seeking returns. Never risk more than you can afford to lose.

2. Edge Required

Every trade must have a statistical edge — a positive expected value over many repetitions.

3. Expectancy

Expectancy = (Win Rate × Average Win) - (Loss Rate × Average Loss)

where: Win Rate fraction of trades closed profitably · Loss Rate = 1 − Win Rate · Average Win mean dollar gain on winners · Average Loss mean dollar loss on losers (positive number). does: expected dollar P&L per trade. The most important number in any strategy review — if it isn't positive net of costs, no amount of position sizing or risk management saves the system. A positive expectancy is the minimum requirement for any strategy.

4. Position Sizing

How much you risk matters more than which direction you bet. Proper sizing determines survival.

5. Discipline

Follow your rules consistently. Emotional decisions destroy edge.

6. Continuous Learning

Markets evolve. Strategies decay. Continuous adaptation is mandatory.

Common Beginner Mistakes

Mistake	Consequence	Solution
No trading plan	Random losses	Write and follow a plan
Over-leveraging	Blown accounts	Risk 1-2% per trade maximum
Revenge trading	Compounding losses	Walk away after 2 consecutive losses
No stop-loss	Catastrophic losses	Always define exit before entry
Over-trading	Fee erosion, fatigue	Quality over quantity
Ignoring fees	Strategy becomes unprofitable	Include all costs in backtests
Chasing performance	Buying tops, selling bottoms	Have predefined entry criteria
Not journaling	Repeating mistakes	Log every trade with reasoning

q&a

What's the difference between trading and investing?

Trading is short-horizon and bet-driven — you take a position because you have a view that resolves over seconds to months. Investing is long-horizon and ownership-driven — you hold the underlying business or asset class because you believe its fundamental value will compound over years. Same instruments, different intent, different tax treatment, very different risk frameworks.

Do I need a lot of capital to start trading?

No, but undercapitalization is the most common reason new traders blow up. With $1,000 you can place trades but the math is brutal: a 1% risk per trade is only $10, which barely covers spread and slippage on most instruments. Most disciplined retail traders start with $10K+ in a margin account, or paper-trade until they have a working process.

What's the best timeframe to trade?

The one that matches your edge, attention budget, and lifestyle. Scalping needs constant screen time and razor-thin costs. Swing trading lets you have a day job. Position trading lets you hold for months and barely watch the screen. Trade the timeframe where your edge is real — not the one that feels exciting.

How do I know if I have an edge?

You don't, until you've stress-tested the idea on data you didn't peek at. An "edge" means your expected value across trades is positive net of all costs. Look for: a clear hypothesis, an out-of-sample backtest, a non-trivial sample size, robustness across parameter changes, and a plausible economic reason it should work.

What should I do first?

Read the rest of 01-foundations/, work through 02-mathematics/statistics-basics, and pick one of the strategies in 05-quantitative-strategies/ to study deeply. Don't trade real money until you've paper-traded a defined system for at least a month and your written rules survive contact with reality.

Next Steps

After understanding what trading is, proceed to: - Market Structure — How markets are organized - Market Participants — Who you're trading against - Order Types — How to execute trades