Learn R with Real Code Examples
Updated Nov 21, 2025
Learning Path
Learn R syntax and basic data structures
Practice data manipulation with dplyr
Explore visualization with ggplot2
Study statistical modeling and machine learning
Build reproducible reports and Shiny apps
Skill Improvement Plan
Week 1: R basics and vectors
Week 2: Data frames, lists, and matrices
Week 3: Functions, control flow, and packages
Week 4: Visualization and reporting
Week 5: Statistical analysis and real datasets
Interview Questions
What are R’s primary strengths in data analysis?
Explain the difference between a vector, list, and data frame in R.
How do you create a plot with ggplot2?
Describe how to build a Shiny app.
What are R packages and how do you manage them?
Cheat Sheet
x <- 10 - variable assignment
c(1,2,3) - vector creation
data.frame() - create data frame
lm(y ~ x, data=df) - linear regression
library(ggplot2) - load package
Books
R for Data Science
Advanced R
Hands-On Programming with R
The Art of R Programming
R Graphics Cookbook
Tutorials
R basics and data types
Data manipulation with dplyr
Visualization with ggplot2
Statistical modeling and machine learning
Building Shiny dashboards
Official Docs
R Project official website
R manuals and reference guides
CRAN package documentation
Community Links
RStudio Community
Stack Overflow R tag
CRAN mailing lists
Bioconductor forums
Data science and analytics forums
Community Support
R Project official website
RStudio community forums
Stack Overflow R tag
CRAN and Bioconductor communities
Data science and academic R groups