I've just realized something quite interesting about financial trading – most people only know how to make money when prices go up, but in fact, 50% of market opportunities are in the downward trend. That’s exactly when short selling becomes extremely useful.

What is short sell? Simply put, it’s a strategy to profit when the asset’s price declines. Instead of buying low and selling high, you do the opposite – sell high and buy back at a lower price. The difference between the two prices is your profit. The core mindset is 'sell first, buy later,' completely opposite to the usual approach.

In Vietnam’s market, short selling stocks directly is still not widely available for retail investors, but derivatives and CFDs allow you to do this quite easily. The mechanism isn’t very complicated – instead of borrowing assets, you just sign a contract for price difference with the trading platform. You press the 'Sell' button on the app, and if the price drops, your account balance goes positive. Orders are matched instantly, without owning the underlying asset.

But why short sell? One reason is leverage. With CFDs, you can short Bitcoin at $100,000 but only need to deposit $10,000 margin if using 1:10 leverage. Your profit multiplies by 10, but so does the risk, so be cautious. The second reason is hedging – if you’re holding physical gold but worry about falling prices, you can open a short gold position on CFD to offset potential losses.

Regarding strategies, each asset class has different shorting methods. Gold, for example, often drops quickly when the Fed raises interest rates or after fears subside. You should short when the price hits a strong resistance zone and a reversal candle appears. Avoid shorting during early morning sessions due to low liquidity and wide spreads that can trigger stop-losses. A good tip is to use Stochastic combined with RSI – if both are in overbought territory (above 80) and start to cross down, that’s a high-confidence short signal.

For US stocks, short selling requires more precision because stocks tend to trend upward over the long term. The best timing is when a company downgrades its growth outlook or when the price breaks important support levels like the MA50 or MA200. A trap to avoid is dividends – if you hold a short position through the dividend date, you’ll have to pay the dividend to the buyer. Always check the economic calendar carefully.

Crypto is the most volatile. You can double your account or burn your wallet in 15 minutes. The best time to short is when Bitcoin breaks key support levels or when altcoins surge 50-100% in a few days (pump and dump). After a price pump, there’s always endless selling. Watch out for funding fees – during strong downtrends, short positions often pay overnight fees to longs, sometimes up to 0.1% every 8 hours.

Risk management is crucial. Never forget to set a stop loss near the nearest resistance zone. If the price reverses upward, accept losing a finger to save the arm. An advanced technique is trailing stop – instead of a fixed stop loss, it automatically moves with the price when the trend goes in your favor. For example, short gold at $2000 with a trailing stop of 10 dollars. When the price drops to $1950, the stop loss automatically moves down to $1960. If the price reverses and hits $1960, the position closes. You still preserve a $40 profit instead of losing everything to the market.

There are some traps to avoid. Short squeeze is one of the nightmares – when too many people short but the price rises slightly, short-sellers panic and buy back to cut losses, pushing the price sharply higher. Avoid shorting low-liquidity stocks or those with rumors of being acquired. A common psychological mistake is averaging down when in a loss – if your initial short is in the red, don’t open additional positions to average the price, as that’s the fastest way to blow your account.

Short selling isn’t for the faint-hearted, but if you combine proper asset selection with disciplined risk management, you’ll see that a downtrend market isn’t a disaster, but a harvest season. Bears often make money faster than bulls because fear spreads more quickly than greed. However, markets only decline about 20-30% of the time; the remaining 70% is up or sideways. So be patient like a hibernating bear – only wake up and hunt when the trend truly breaks.

Remember that short selling is a tool, not an end goal. Focus on the ‘black swans’ – companies with poor earnings or coins with no real utility but overhyped. That’s where the best profits for bears lie. In today’s volatile markets, understanding what short sell is and how to use it will open up half the opportunities you previously couldn’t take advantage of.