R Draw ggplot2 Plot with Lines & Points (Example) | Add Scatterplot Line

Graphics with ggplot2 Tutorial

Control Size of ggplot2 Legend Items in R (Example) | Adjust Symbols

Create Legend in ggplot2 Plot in R (2 Examples) | Add Legends to Graph

Divide Legend of ggplot2 Plot in R (Example) | Split into Multiple Parts

ggplot2 Plot with Different Background Colors by Region in R (Example)

Draw ggplot2 Plot with Two Y-Axes & Different Scales in R (Example)

R Draw ggplot2 Plot of Data Frame Subset (Example) | Particular Rows