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R programming for beginners. Manipulate data using the tidyverse: select, filter and mutate.
Manipulate your data.   Data wrangling.   R programmning for beginners.
R Programming Tutorial - Learn the Basics of Statistical Computing
Dplyr Essentials (easy data manipulation in R): select, mutate, filter, group_by, summarise, & more
Manipulate and clean your data in R with the dplyr package
Introduction to R for Finance: Data frame manipulation
R programming for ABSOLUTE beginners
Introduction to R: Manipulating data with dplyr (Sep 2, 2015)
Learn R in 39 minutes
R programming for beginners -  Why you should use R
Hands-on dplyr tutorial for faster data manipulation in R
Harvard CS50’s Intro to R Programming – Full University Course