When a day trader is in a long trade, they bought an asset and are hoping the price will go up.
Day traders in short trades sell assets before buying them and are hoping the price will go down. They realize a profit if the price they buy it for is lower than the price they sold it at. "Shorting" is confusing to most new traders since in the real world we typically have to buy something in order to sell it. In the financial markets, you can buy and then sell or sell then buy.
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