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

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

ggplot2 - How to draw and fill polygons from a SpatialPolygonsDataFrame with R plotly - Stack Overflow

Overlaying spatial polygon with grid and checking in which grid element specific coordinates are located using R - Geographic Information Systems Stack Exchange

Fast way to convert raster to polygon shapefile in R - Geographic Information Systems Stack Exchange

r - sf lines to polygons with holes - Geographic Information Systems Stack Exchange

r - Improving positioning of map / polygon labels - Stack Overflow

arcgis desktop - Determining the area of each polygon within a polygon boundary? - Geographic Information Systems Stack Exchange

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

geometry conversion - Convert polygons into spatial points to use R redlistr package - Geographic Information Systems Stack Exchange

R - tmap: Add thick border and transform counties with NAs to diagonal stripes - Stack Overflow

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

How to make gradient color filled timeseries plot in R - Stack Overflow

How to make gradient color filled timeseries plot in R - Stack Overflow

qgis - Change color polygons by area of polygons - Geographic Information Systems Stack Exchange