An exit strategy must be in place before the trade is initiated. Should the trade become a winner, the exit strategy would be revised to lock in gains. The trading strategy is to go long stocks that are near support levels and short stocks near resistance levels. As triggers, I would use key candlestick patterns, price reversals and gaps to enter a trade. This is just one hypothetical strategy that combines goals with style and commitment.
Some people have different portfolios that represent different goals, styles and strategies.
While this can become confusing and quite time consuming, separate portfolios ensure that investment activities pursue a different strategy than trading activities.