股票買入前決定：1. 賣出價位，2.止損價位，3. 收益和風險比, 4. 持股時間（DT 或ST）。 keeping a trading diary.
指標: moving average, envelopes or channels, support and resistance zone, other methods.
1. moving average: use weekly chart make decision( to predict target price zone, e.g. between two moving averages) and daily chart to exit.
2. chnnels: as price goes up, the moving averae lag behind the price move. This is why moving averages do not make good targets during steady uptrends. 從這點上看，買賣ugaz，jnug, uwt和LABU要用趨勢線結合支撐和壓力線更有效。此時，moving average幫著確定股票價值，而channel來確定超買和超賣。
a trading system without stops is not a system.
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