Data.frame vs Data.table in R? Data.table package is claimed to be faster than Data.frame. what are the implementation changes that made this possible? How can one leverage the power of this package for data analysis?
You have a nice free course about it on DataCamp


  Data Analysis in R, the data.table Way


The author of the course is Matt Dowle, the guy that actually wrote the data.table package.

Hope that helps.