Going long in perpetual futures trading means holding a long position. In spot trading, when a trader judges that the market will rise, he or she makes a buy operation and waits for the rise to sell. In perpetual futures trading, however, there is no direct trading of cryptocurrencies, but rather a new purchase of a certain number of contracts of a certain type when the user is long or bullish. The "buy to open long" operation is performed and the long position is increased after the order is successfully filled.
Bitunix perpetual contracts allow users to go long directly by simply entering the price and quantity in the perpetual contract product and selecting Buy to hold a long position.
If you want to learn how to open a long position, you can click here: