Facet Wraps in ggplot2: Mastering '~' and '.' for Customized Faceting Schemes

Fixing Axes and Column Bar: A Solution to Overlapping Facets in ggplot2

Customizing Facet Wraps with ggplot2 for Consistent X-Axis Ticks

Faceting Text on Individual Panels in ggplot2: A Customizable Annotation Solution