There are three patterns of "Limit Order" "Stop Order" and "Market Order" in trade.
Let me tell you "how to have position", which is actual how to trade.
Market Order
"Market order" is a kind of selling and buying order without naming a price. There are many kinds of system as to trader. But trader usually clicks a button watching value change. As a chart does not generally stop, it may happen that there would be a gap of some points.
Limit Order
"Limit order" is a kind of selling and buying order with naming a desired price. When long position, we want to buy as cheap as possible. For example, when an exchange rate is 115 yen, you price 114.9 yen as limit order. And when a market decreases down to there, it hits!
Stop Order
"Stop order" is a kind of selling and buying order with naming more unprofitable price than current price. You must think it why. Current condition is unchangeable market within 115 yen. But, once the rate starts increasing, it may be up to 116 yen. Or it may be down to 114 yen. Nobody knows where to go. In that case, that is "stop order" making a lot of money riding on a dull market.
"Market follower" is taking a position following a trade trend. And "contrarian" is taking a position against a trade trend. These words are used in a market order.