The biggest "gotcha" for learning R as a programmer is that R interprets character vectors of data frames as factor vectors by default, which will usually break something in your code.
If you're learning R, learn to use dplyr for data manipulation and ggplot2 for plotting. Both will save you a lot of time.
If you're learning R, learn to use dplyr for data manipulation and ggplot2 for plotting. Both will save you a lot of time.