The core function of the trend line is to outline the inertia of price movement. (Inertia is key)

The most basic method of drawing is to connect multiple higher lows, allowing the line to extend along the upward rhythm.

When drawing the line, it is important to ensure that the trend line ideally follows the lower shadows and does not press against the K-line body. If the body frequently breaks below the trend line, it indicates that the line has become invalid.

Therefore, an effective trend line is not just a visual reference, but an important tool for judging rhythm and controlling risk.