The EMA moving average is the most direct reference for distinguishing between 'Left-side and Right-side Trading'.

When the price is above the moving average: going long is right-side, going short is left-side;

When the price is below the moving average: going short is right-side, going long is left-side.

Only trade right-side around support and resistance, without needing to predict market turning points, which can avoid 80% of unnecessary emotional fluctuations and trading fatigue.