R is open source which makes it a first choice for students, universities & researchers. With over 2 million users world wide, the enhancements & updates to the product outsmart the pace at which the business world is upgrading. Other statistical tools can perform a lot of statistical analysis, however, R can perform ALL the statistical analysis which can be done by all other statistical tools put together. All this come for free as there is no license cost for R.
Watch this video
R is explained in depth here. You will learn Introduction to R Programming, Essentials of R Language, Data Inputs, Data Frames, Graphics,Tables, Mathematics,Classical Tests and a lot more.