How to Create a ggplot2 Plot with Multiple Lines Colored by Two Categorical Variables

Customizing X-Axis Labels in ggplot2 Facets Using Grob Structure

Controlling the Order of Facet Grid/Facet Wrap in ggplot2: A Step-by-Step Guide to Customizing Your Plots

Understanding the Behavior of scale_color_discrete(drop = TRUE) in ggplot2: A Guide to Troubleshooting Missing Values

Visualizing Grouped Data with ggplot2: Mastering Level Order and Best Practices

Understanding Stacked Bar Charts and Why the Y-Axis Doesn't Match

Understanding the Problem with Wrong Border Colors in ggplot2: A Step-by-Step Solution to Fixing Incorrect Color Representation.

How to Use the Grid Package in R for Customizing Plots and Layouts