Where can I learn more about Bigdata. What are the best online resources for learning bigdata
Here are a few resources you can look at:
BigDataUniversity: Probably the best resource to get you started. It has a lot of free courses on Big Data.
Courses on edX and Udacity: There is a free course on Introduction to Hadoop and MapReduce on Udacity and 2 courses on edX: Scalable Machine Learning and Spark. You are free to signup for both of them. There is also a course on MongoDB, which you may want to consider.
The Cloudera Virtual Machine and certification guide: Cloudera offers a VM download for preparing for its certification. You can also look at that
Hope this gives you enough starting points in the journey.