Trendlines, to me, are drawn arbitrarily. I just use them as a sort of "comfort line". If I am on the right side of it I feel fine and have no worries. The rule that they must be drawn across the tops or bottom is, more or less, telling the market what to do. How can you expect that of a price? When the price cuts the trend I look to see if a pattern is forming. If the pattern is continuous, I revert to a trendline, again, almost certainly, the momentum will have changed but if I keep to the right of it in a bear and to the left of it in a bull then I am OK- Whenever it crosses, it is a warning to pay attention to the trade, nothing more.
There is nothing to be learned from trendlines, IMO anyway, except to help keep the ship on course. Go inside it and you are entering into shallow water.
Split