EUO hit the 200 day MA where it logically pulled back, you could have held with a wide stop commensurate with your risk tolerance, or sold at the 200 MA and looked to buy back.  

 you have to decide for yourself sometimes, this is an open ended trade.  I have the comments there, read it and decide if you wish to give a wide stop below 20 or not.  

Always have a stop in place when you enter a trade, don't just enter a trade and then leave it without a stop, if you don't know where to set a stop, dont' enter the trade

Some trade ideas I suggest an initial stop like BZ that had resistance at 9 with an initial stop at 8.75, if you need more hand holding, perhaps you should stick to the trade ideas that only have initial stops listed.  Many don't and so avoid those and only take the ones with initial stops listed