how to read trend switch using trendline?

answer is simple: the slope of the trendlines will change too, the the trend is changing;

thus I need multiple trendlines to follow trend, they are main trendline, many sub trendlines;

if themaintrendline is broken, then you need pay special attention if you continue trading the trend, as the price could drop or up quickly against the original main trend;

 

cool, is it?