Understanding the Issue with Dollar Sign Notation in aes(): Avoiding Faceting Problems with ggplot2

How to Install Packages in R: A Step-by-Step Guide for Beginners

Counting Rows Per Group in R Data Frames Using Multiple Methods

Using Dynamic Column Selection in R: A Workaround Around the `$` Operator

Joining Data Frames in R: A Comprehensive Guide to Inner, Outer, Left, and Right Joins