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

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

r - SpatialPolygonDataFrame plotting using ggplot - Stack Overflow

R Buffer/Enlarge a polygon - Stack Overflow

Joining spatial polygons by code in R? - Geographic Information Systems Stack Exchange

Extract areas of multi-part polygons (SpatialPolygonsDataframe) R - Geographic Information Systems Stack Exchange

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

maps - Changing/adding spatial boundaries/polygon shapefile R - Stack Overflow

r - Some polygons failing to fill with color - Geographic Information Systems Stack Exchange

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

gis - How to change the border color of a polygon based on an attribute value in R tmap - Stack Overflow

r - SpatialPolygonDataFrame plotting using ggplot - Stack Overflow

spatial statistics - R (spatstat, sp, sf): Grid a single polygon, divide, alphanumeric labels based on column/row - Geographic Information Systems Stack Exchange

Fishnets and Honeycomb: Square vs. Hexagonal Spatial Grids