When trading contracts, do not underestimate the transaction fees. This can be a significant expense, and novice players may not understand this and carelessly throw away money that should belong to them. High-frequency traders even say that the fees might exceed your principal. Originally, the trade was profitable, but when you check your account, it shows a loss—all because your fees were drained away. For example, Binance charges a 0.05% fee on market orders. If you open a position of 1000 USDT with 100x leverage, it would be calculated as 1000*100*0.001=100 USDT. If you get a rebate back to your mobile, it's only 35 USDT. Usually, relying on rebates can help you make a living, so it is very necessary to open a $ETH $BTC