Basic Trendline ?

using a trendline must be good as you use a straight line to analyze an up or down trend. 

I don't like trading with trendlines. In my opinion, there are actually many better ways of trading than using the trend line.

using a trendline it is usually used when there is a true trend that way we can open a position when it comes back

Trading using trendline is fun, and quite easy to do

good mastery of the trendline makes us safe for entry

A trendline in forex trading is a straight line that connects two or more price points on a price chart. The basic trendline is the simplest and most commonly used trendline in forex trading. It is drawn by connecting two or more low points in an uptrend or two or more high points in a downtrend.
The basic trendline is a useful tool for traders because it can help identify the direction of the trend and potential areas of support or resistance. In an uptrend, the trendline is drawn by connecting the two or more low points on the chart, and it can be used to identify potential areas of support where traders may look to enter long positions. In a downtrend, the trendline is drawn by connecting two or more high points on the chart, and it can be used to identify potential areas of resistance where traders may look to enter short positions.
It's important to note that trendlines are not always accurate and should be used in conjunction with other technical analysis tools and fundamental analysis. Trendlines can also be subjective, as different traders may draw trendlines differently based on their interpretation of the price action. As with any technical analysis tool, it's important to use trendlines in combination with other indicators to confirm or refute trading signals.