Can't answer whether to learn R or Julia, but for a more general education on Data Science, this book might be a really good fit for you: Data Smart: Using Dat

Can't answer whether to learn R or Julia, but for a more general education on Data Science, this book might be a really good fit for you: Data Smart: Using Data Science to Transform Information into Insight https://www.amazon.com/Data-Smart-Science-Transform-Information/dp/111866146X/ https://www.amazon.com/Data-Smart-Science-Transform-Informat... All the work is done in Excel. I enjoyed the book quite a bit. Author is Chief Data Scientist for MailChimp.