Master Notes are a special combination of spell glyphs in Harry Potter: Wizards Unite. In order to prepare a potion, you have to collect Ingredients which are necessary for it, and use them. In addition to this, if you use right Master Notes to brew a potion, the brewing time of the potion will reduce. So, just collecting and using Ingredients are not the most efficient method of brewing a potion. To reduce the brewing time, you have to use Master Notes which are on this category. For example, in order to prepare a Healing Potion, respectively you have to zoom, clockwise turn, tap multiple, and pinch. When you do these actions while you are brewing Healing Potion, the brewing time will reduce. The most efficient method of brewing a potion is this.