Type of Forex Trading Orders

Trading currency business you only buy or sell currency. So you just buy or sell if you determine these and of course instant execute trades. But there are some trading order you have to  learn. These are called pending orders.
1. Buy & Sell stop : If the market is gone certain pricing level you wish enter buy or sell currency then these types are right for you. So at a certain price level you believe that the market will move up or down and you have to  execute buy or sell stop order. If you are not in front of a computer no problem meta trader executes trade even if you are not live...
2. Buy & Sell limit : These orders are opposite of buy and sell stop order. Suppose you notice that the price is upping and you believe that after a while market will be turned down at a certain price level and again it up. Now your marking down  price level where  you have buy limit order. And your analysis that the market now down but will be up and  again it will be down now your marking up price level where you have sell limit order.
3. OCO ( once cancels other) : 2 orders at a same time (above & below current market price)  but execute one which touch or reach firstly and at the same time other order cancel.
4. Trailing stop order: Suppose you enter a buy or sell then if the market go in your favour, you  wish to lock up some profit / pips / points then trailing stop order you have to be  set off. Generally it is set by pips or points. O.. Oh.. Sound like good yeah meta 4 just lock your profit and if locking profit price is  trying  to break then meta 4 close your trade and lock / save your profit.