Your first stop for any help related to computing with data should be the book: Getting used to R, RStudio, and R Markdown.
- Datacamp: Intro to R Course: online platform for learning the nuts and bolts of R.
- swirl: Learn R, in R: an altervative interactive platform for learning R.
- Prezi on Reproducible Research through R Markdown
- YouTube video on using R Markdown with RStudio
- R Markdown debugging reference sheet
- Visit the CTLR tutoring page for more information.