r - How do I change the polygon fill color and border color for SpatialPolygons objects? - Geographic Information Systems Stack Exchange

I have SpatialPolygons or SpatialPolygonsDataFrames which I'd like to plot. How do I change the color using the three plotting systems in R (base graphics, lattice graphics, and ggplot2)? Example

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gdal - R spatial: Erase one polygon from another: correct use of `st_difference`? - Geographic Information Systems Stack Exchange

r - How do I change the polygon fill color and border color for SpatialPolygons objects? - Geographic Information Systems Stack Exchange