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Lawrence, VJAY answered your question nicely. You need to learn a methodology to trade by, and then it will show you the reversal points. I posted a chart. The only reason I'm doing it is to show how to do it, but it is not meant for you to copy my methodology, and be it far from me to ever say I have the only one that is any good.
It is a chart of crude oil. It is currently moving north, but the top of the cloud looks to contain this move, at least temporarily. There is additional R on top of the cloud in the form of the tenken.
At the bottom of the cloud you knew it was going to reverse, because that gold line is the bottom of a standard deviation channel which formed a confluence with the cloud.
This is just a tiny microcosm of what is there to use. The best thing is to experiment with indicators, or trendlines, or chart S&R's, or drawing tools, or candlestick patterns, or whatever else comes to your mind, then post in this forum your findings, and then there are many of use that will be willing to dissect whatever you got, and help you along your journey.