Fans and arcs can illustrate angles of advance, but they are easy to misuse. The first mistake is drawing them on every corrective leg until the chart looks like a geometry exam. If you cannot explain why a particular fan is in play, remove it.
The second mistake is treating a fan line as precise support without checking horizontal structure. Price may “respect” a fan simply because it is reacting to a prior high or a round number that happens to sit nearby.
The third mistake is changing the anchor mid-move to make the fan fit the last few candles. That is curve-fitting, not analysis. Pick anchors with the same discipline you use for retracements, then leave the drawing alone.
We cover fans briefly in the masterclass so you know when they add a slant to an already sound horizontal plan — and when they are clutter.