Making a decision changes a state of possibility into a state of intention. Like turning batter into cake. Intention followed by action followed by reflection is the only route to learning. Like eating the cake and seeing how it tastes.
The making of a decision is the point at which multiple possibilities resolve to the choice of a path forward. Ideas become plans, intuitions become direction and opinions give way to responsibilities. There is a transition from one state to another through discussion and consideration of relevant information. At that point, action is needed.
Once a decision is made, that cake cannot be unbaked, you need to try it to know what you think of it and how to improve the next.