A trendline's validity is dictated by its structure and the number of times the market respects it.
: A valid trendline requires at least two points (swing highs for downtrends, swing lows for uptrends). Trendline Breakout Trading Strategy
Guide to exploring the Trendline Trading Strategy - Capital.com A trendline's validity is dictated by its structure
: A third touch is widely considered the gold standard for confirmation, signaling that the trend is established and not just a coincidental connection of two points. Trendline Breakout Trading Strategy
: Touches should be well-spaced rather than clustered. Steep trendlines are prone to "noise" and are often less reliable than those with a moderate slope.