One of the key functions of a Geographic Information System (GIS) is to visualize data. In a GIS, we use maps as our primary method for visualizing data. Maps allow us to see and analyze the spatial relationships between features in one or more layers. We create maps for many different reasons. Often, we are trying to show the location of specific assets or to highlight attributes associated with features, such as a parcel's zoning classification or a pipe size. Sometimes we wish to show the results of the analysis we have performed.

So, each map we create in ArcGIS Pro has a reason for existing. This purpose will help to dictate what layers we include in the map and how they are visualized. There is no limit to the number of layers a map can contain. However, it is possible to have so many layers in a map that it distracts from the purpose. As the author of the map, you must strike a balance between...