Alternatives to grid.arrange: A Better Way to Plot Multiple Plots Side by Side

Aligning Facets and Legends: A Comparative Analysis of ggplot2, Cowplot, and GridExtra

Customizing ggplot for Multiple Page Layouts in a Single PDF

Creating a Customizable Grid of ggplot2 Graphs with R and gridExtra.

Creating Complex Plots with ggplot2: Mastering grid.arrange() for Data Visualization in R