Mathematica gives you the power to customize every aspect of the styling of your plots. These "How tos" give step-by-step instructions for common details of appearance.
Work with Spline Functions Create Graphics with Spline Primitives Create Plots
ChartLabels is an option for charting functions that specifies what labels should be used for chart elements.
LabelingFunction is an option for charting functions that specifies a function to apply to determine labeling of chart elements.
Placed
(Built-in Mathematica Symbol) Placed[expr, pos] represents an expression expr placed at relative position pos in a chart or other display. Placed[{e_1, e_2, ...}, pos] places each of the e_i at a relative ...
StatusArea[expr, string] displays string in the status area of the current notebook when the mouse pointer is in the region where expr appears.
OrderStarLegend is an option to OrderStarPlot that specifies whether to display the legend of symbols used to represent zeros, poles and interpolation points.
AxesLabel is an option for graphics functions that specifies labels for axes.
ChartElements is an option to charting functions such as BarChart that specifies the graphics to use as the basis for bars or other chart elements.