There are two different types of gold trendlines - upwards trend-line & downward gold trendline. Tutorial of how to draw trend lines for upwards trend and how to draw trend lines for downwards trend is illustrated:
How Do I Draw Trend Line for Swing Trading
To draw an upwards gold trend line we use support levels. To draw upwards trendline correctly 2 support levels are used like as displayed on the up-wards trendline example illustrated and explained - How to Draw a Trend Line for Swing Trading.

How Do I Draw Trendlines for Swing Trading on Charts - How Do I Draw Upward Trendline
Downwards TrendLine
To draw downwards gold trendline we use resistance levels and to draw downward trend line correctly 2 resistance levels are used as is shown on the downward gold trend-line example illustrated and explained below - How to Draw a Trend Line for Swing Trading.

How Do You Draw Trendlines in Charts - How Do I Draw Downward Trend-Line
How to Draw Trendlines
To draw Trendlines for Swing Trading on MT4 XAUUSD Charts use MT4 Charts Plotting Tools for Drawing Trendlines on MT4 XAU/USD Charts
The MT4 trend-line drawing tools used to plot gold trendlines on MetaTrader 4 are located on the MetaTrader 4 drawing charts toolbar within MT4 platform, To access this MT4 charts drawing tools tool-bar if it's not activated on your MT4 platform, Press 'View' Just Next to 'File' menu at left top corner of MT4 platform & click 'View', Then Click on "Gold Tool-Bars", Then Tick on the "Gold Lines Toolbar" by clicking on it - XAUUSD MT4 Draw TrendLine Tools for Swing Trading - MT4 Trend-Line Drawing Tools.
Below are MT4 trend line tools for gold charts. Click the tool to pick spots for up or down trend lines on gold.

How Do I Draw Trendlines for Swing Trading
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