If the price is above the 200 EMA, you are allowed to open only long positions and avoid shorts. If the price is below the 200 EMA, you are allowed to open only short position and avoid longs. Don't use this indicator alone, use RSI, Stochastic RSI etc. Do not use this indicator like a bot, do TA and FA as well. This is just an indicator, do not always rely on it. It requires experience. This indicator has different winrate in different timeframes. Set its value accordingly.