Here are the areas of Rtraining that you can peruse
Getting better with data
Board Packs
Data Docker Disconbobulating
datatable in 5 minutes
Git in 5
Infrastructure for R peeps
Knowing your Rs from your elbow Being lazy with infrastructure
Personal branding
R for developers
Reproducible R docs in GitHub
Intro to R
Cut the R Learning Curve
Microsoft SQL Server and R Services
Skilling up to code with data
Stats 101
Analytical web services
The You in Community