You can create buy and sell orders at the same time as long as you have enough money. Enough means having both BTC to sell and USDT to buy.
1 BTC to sell and enough USDT to buy 1 BTC at buying price for your order. It makes no sense because the volume of BTC is big and you can not become a whale.
If you are trading in low volume altcoins, you can create both buy and sell orders. Big orders to make them as buy and sell walls. You can control price in your wall areas.
1 BTC to sell and enough USDT to buy 1 BTC at buying price for your order. It makes no sense because the volume of BTC is big and you can not become a whale.
If you are trading in low volume altcoins, you can create both buy and sell orders. Big orders to make them as buy and sell walls. You can control price in your wall areas.