Big data analytics references
I tried to explore some of the best available resources, which includes online courses (Free/Paid), Books etc.
Books


Big Data and Analytics (WIND)
Hadoop for Dummies
Big Data for Dummies
Hadoop: The Definitive Guide
Learning Spark: Lightning-Fast Big Data Analysis
MapReduce Design Patterns


Online Courses
These are some best platforms that provide lots of courses with rich content and hands-on labs. You can go from beginner to expert level, followed by intermediate. (courses will be - Free/Paid  )


Udemy - Big Data Analytics Courses
Coursera - Big Data Analytics Courses
edX - Big Data Analytics Courses
Udacity - Data Analysis


Other References
For more thoughts on that you might like to explore these websites-


Quora
Big Data - Made Simple
From Dev
KDnuggets


Update [BigData in R]
You can go through these references-


Wikipedia - Programming with Big Data in R
RStudio - Working with BigData in R
InfoWorld - Learn To crunch BigData with R


That's all from my side. Hope it helps. Cheers!