I buy when they cross above the 400 day on a . I sell when I see a significant change of direction and use smaller to exit. On this trade I will have exited if it fell back below the 400. Keeping my losses to a minimum. If the price moves up my stop loss moves to a smaller , such as the 200. Making the trade a 400 entry 200 exit. If the trend continues the stop could stay on the 200 if you are interested in a long term hold (i.e. 1 year +), or a shorter term outlook means you could exit when the price falls below the 50.