The two Refine dimensions, Group By and Playback, do not change the appearance of the dataset, but are useful for organizing, filtering, and animating the visualization.
Articles for Mapping
Dimensions in this group are very useful when creating multi-dimensional visualizations. Adding features to these dimensions, especially Color, has strong visual effects on the appearance of the plot that are easy for people discern.
Adding features to the X, Y, and Z axes defines the position of the points in your visualizations. At least one axis must have a feature for all plot types.