A swing high is a setup where the fractal candle has two lower candles on each side. The most recent fractal formed is the pivotal line and market flow is bearish until this high is broken to the upside.
A swing low is a setup where the fractal candle has two higher candles on each side. The most recent fractal formed is the pivotal line and market flow is bullish until this low is broken to the downside.
Keep in mind that you need only to monitor the most recent swing points for Market Flow.
EUR/USD just recently breached the swing point I labeled as “1” and with this, Market Flow is currently down. For Market Flow to be bullish again, EUR/USD has to trade above the most recent swing high, which currently is the one formed yesterday, labeled as “2”.
You can use it only on one timeframe (H4 is favourable) or with the H1, H4 and Daily. If market flow is in agreement with all three timeframes, the momentum of the price movement is very strong.