A limit order is an order that you place on the order book with a specific limit price. The limit price is determined by you. The trade will only be executed if the market price reaches your limit price.
Submitting a limit order on DODO does not incur gas.
Limit orders submitted on DODO will be filled by one of the following sources if they ever hit their limit price: liquidity pools on DODO, aggregated liquidity pools from other protocols, and limit buy/sell orders sent by other users.
How to trade on DODO using the Limit Order feature