Graphics with ggplot2 Tutorial

A Detailed Guide to ggplot colors | R-bloggers

Transparent Scatterplot Points in Base R & ggplot2 | Decrease Plot Opacity

Draw Scatterplot with Labels in R (3 Examples) | Base R & ggplot2

R Change Point Size in ggplot2 Scatterplot (Example) | Increase/Decrease

Draw ggplot2 Plot with Grayscale in R (2 Examples)

Change Position of ggplot Title in R (4 Examples) | Center, Right & Vertical

Overlay ggplot2 Boxplot with Line in R (Example) | Add Lines on Top