How to use trendlines.
Pretty easy. You see a increase in price?
Try and find the bottoms of the candles and draw an ascending trendline
You see a decrease in price?
Find the tops of the candles and draw a descending trendline.
See a decrease in volatility?
Find the bottoms and tops and draw a symmetrical triangle.
See an increase in volatility?
Find the bottoms and tops once again and draw an expanding wedge.
A basic explanation of trendlines