Have you ever wondered why people talk about 'long' and 'short' when trading cryptocurrencies? At first, it sounds complicated, but in fact, it’s quite simple and is the foundation of most trading strategies.

So, what is long? Put simply, going long means you’re betting on an asset’s price to rise. You buy it at the current price and wait for it to increase, then sell it at a higher price. Simple example: if you believe Bitcoin will rise from $61,000 to $70,000, you buy at $61,000 and wait. When it reaches $70,000, you sell, and your profit is $9,000 (minus fees). This is called a long position.

On the other hand, short is when you bet on a price decline. You borrow an asset from the exchange, sell it immediately at the current price, and then wait for the price to drop so you can buy it back at a lower price. Profit is the difference between the selling price and the buy-back price. For example: you borrow 1 Bitcoin at $61,000 and sell immediately. When the price drops to $59,000, you buy back and return it to the exchange, making $2,000 (minus borrowing fees).

Traders who believe in price increases are called 'bò đực'—they open long positions, driving demand and pushing prices up. Those betting on price decreases are 'gấu'—they open short positions, pushing prices down. From there comes the concept of a rising market (bull market) and a falling market (bear market).

Many users trade long and short using futures contracts without actually owning the underlying asset. Perpetual futures (perpetual futures) are very popular—there is no expiration date; you hold the position for as long as you want. You only receive the price difference, not the actual asset. This enables faster trading, but it also comes with periodic funding costs that you must pay.

Want to reduce risk? You can hedge—open an opposite position. For example, go long 2 Bitcoin but short 1 Bitcoin. If the price rises from $30,000 to $40,000, you make (2-1) × 10,000 = 10,000 dollars. If the price drops to $25,000, you only lose $5,000 instead of $10,000. That’s how hedging works—it reduces risk, but it also reduces potential profit.

One thing to remember is that liquidation can happen when you trade on margin (vay tiền). If prices move sharply and your margin isn’t enough, the exchange will automatically close your position. Many beginners don’t understand this point, so they get liquidated quickly.

Long positions are easier to understand because they’re similar to normal buying. Short is more complex and has higher risk because price drops often happen quickly and are harder to predict. If you use leverage (leverage), profits can be many times larger, but risks are too—you must monitor your margin level continuously.

In summary, long is betting on an increase, and short is betting on a decrease. Both can generate profit if you’re right, but can also lead to losses if you’re wrong. The key is to manage risk well, not borrow too much, and always have an exit plan before trading.