ggplot2 Basics
Explore the grammar of graphics and create your first ggplot using aesthetic mappings.
ggplot2 Basics is a free R Academy lesson on CoddyKit. This is lesson 1 of 3. Any 3 lessons of this learning path are free to read in full — after that, CoddyKit PRO unlocks every lesson, plus hands-on practice with a built-in code editor and a 24/7 AI tutor. It is part of the R Academy learning path, and your progress syncs across the web and the CoddyKit app. The R Academy course includes 3 lessons in total.
Introduction to ggplot2
ggplot2 is a powerful visualization package in R that follows the grammar of graphics approach.
Installing and Loading ggplot2
Before using ggplot2, install and load the package.
install.packages('ggplot2')
library(ggplot2)Creating a Basic Plot
Use ggplot() to create a simple scatter plot.
ggplot(mtcars, aes(x=mpg, y=hp)) + geom_point()Understanding Aesthetics
ggplot2 maps data to visual properties like color, shape, and size using aes().
ggplot(mtcars, aes(x=mpg, y=hp, color=cyl)) + geom_point()Adding Layers
Layers like geom_line() and geom_bar() add more visual elements.
ggplot(mtcars, aes(x=factor(cyl), fill=factor(cyl))) + geom_bar()Customizing Themes
Modify the appearance of a plot using theme().
ggplot(mtcars, aes(x=mpg, y=hp)) + geom_point() + theme_minimal()Faceting
Faceting allows you to create multiple plots based on categories.
ggplot(mtcars, aes(x=mpg, y=hp)) + geom_point() + facet_wrap(~cyl)Saving ggplot2 Plots
Use ggsave() to export plots.
ggsave('ggplot_example.png')ggplot2 Basics Summary
Summary
In this lesson, you learned:
- How to create plots using ggplot2.
- How to customize aesthetics, themes, and facets.
- How to save plots for future use.
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Frequently Asked Questions
Is the “ggplot2 Basics” lesson free?
Yes — any 3 lessons of the R Academy learning path, including “ggplot2 Basics”, are free to read in full here on the web. After that, CoddyKit PRO unlocks every lesson, plus interactive practice with a built-in code editor and a 24/7 AI tutor. The R Academy course includes 3 lessons in total.
What will I learn in “ggplot2 Basics”?
Explore the grammar of graphics and create your first ggplot using aesthetic mappings. You practise R Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start R Academy?
No prior experience is required. R Academy on CoddyKit is structured for beginners through advanced learners, so you can start here or from the beginning and move at your own pace. This is lesson 1 of 3.
How long does the “ggplot2 Basics” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this R Academy lesson?
Yes. Every R Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.
All lessons in this course
- ggplot2 Basics
- Layers and Geoms
- Theme Customization