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A Bracket order is a cover order type where you create the first leg position (buy/sell) at market price and simultaneously need to place a square off order for profit booking (target) and a stop loss from a single order panel. This help’s to limit downside and lock in your profit/loss.
A BUY order is bracketed by a high-side sell limit order (profit booking) and a low-side sell stop order and vice versa for a SELL order. When either of the order (profit or stop-loss) gets executed, the other order will be cancelled.
Bracket order comes with Trailing Stop loss functionality which would help minimize the loss further.

Bracket order is only available for cover product.
Trailing Stop loss means that when the market price of the equity or future moves towards your target price (book profit price), the stop loss price is revised accordingly.
Yes, it is mandatory to mention a book profit price to complete the bracket order.
The trail will take place at the same tick rate of the underlying stock/contract. For example: For a nifty contract, the minimum movement is 0.05, and hence, the same will be the minimum movement for the trailing stop loss.