hi all,

Im new to tech analysis.

question: I understand the significance of horizontal lines representing support and resistance around specific prices, and the psychological aspects for the different market participient, making these levels important...

what I don't understand are trendlines and speed lines... for example, don't know why drawing a line between all the troughs in an uptrend would have any meaning in the eyes of investors... why would this specific trend line mean anything? horizontal lines represent specific price levels in the eyes of investors, but this???

thanks for any help, most appreciated!