It is the most up to date software; it will make you more attractive on the job market; and enable you to do any analysis from one program. The two (linked) articles explain why, and give a great list of resources for how to learn, including Coursera :
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If you are reading this article, you’ve likely heard of the programming language R but may be avoiding it. R is a programming language for statistical computing and graphics that you can use to clean, analyze, and graph your data.
Below are some great tutorials that are freely available online and are great introductory tools for getting you started on your journey to R mastery. The R Website (free) This is the website where you download R. Many of the packages you will want to use are available here. YaRrr!