Short selling is the act of selling before buying. For example, the current price of Bitcoin BTC is $65,438+00,000. You expect the price of BTC to fall, so selling BTC when the price is still $65,438+$00,000 is short. After that, the price of BTC dropped to $8,000, and you bought it when it was low. This is called liquidation. So you can profit from the difference.

Buying more is the opposite of selling short. This is an act of buying before selling. It seems that the current price of BTC is $65,438+00,000, but you predict that the price of BTC will rise in the future. Then buying BTC at a lower price before the price rises is called buying. Then wait for the price of BTC to really rise to 15000 USD. At this time, you are selling your BTC, which is called liquidation.