How to Trade with Limit Orders in Coinut

Limit orders may not be filled immediately. For our case, because we want to buy LTC with BTC, so we need to set the price high enough to get filled immediately. But how high is enough? We can check the order book at the right side as the following.Because we are buying, we want to know at what prices others are selling. We can see from the following picture that the lowest price that people are