Trend lines are drawn on charts to help predict the general direction of price.It also help to determine good entry and exit point.they also help to see the reversals.
Trendline function as a technical tool is no doubt. In addition to helping identify trends, this tool can also be used to find entry points. When starting to line the chart with the trendline, the most important knowledge is that everyone will not be the same in drawing the trendline line.