If you are holding one stock and it has a large profit, it is beneficial to be able to sell into strength. That can be done at arbitrary profit % (say, partial profit booked at 20% profit). Or, you could use weakness in the charts at the top of price move to book at least partial profit.
Here is how you could apply such techniques on this stock, $CCJ, today.
The stock is at Price Extreme High (1) and displaying a bearish Headwind reversal signal (2) today. It is also breaking below the daily Memory trendline resistance. That is showing weakness at the top. Weekly is not bearish yet, the candle shape is indecisive. If it comes down a little bit more, it will create a false upside breakout at the Watermark pivot resistance (4) - a bearish pattern.
Its industry was one of the strongest. And today it is one of the bottom 20% in terms of boht Score/strength (5) and Pace/deceleration (6).
CUE Vital fundamental scorecard shows 100% of peer stocks are down (7). The stock is overvalued (8). That allows shorting. Earnings is coming soon (9) - that adds to uncertainty.
The above real-time analysis suggests selling the stock into strength or at least apply trailing stop. If you are considering shorting, you may consider a strategy that is applicable near the earnings.
Using CUE Finder, you could find this and similar stocks at reversal points in real-time. CUE Finder shows signals as well as possible trade setups. $CCJ is showing possible Headwind reversal (10) as well as a Breakout (11) short setups as of now, while at Price Extreme High (12). You may see if these are confirmed at the close.