As Muhammad said coursera has lot of courses.

upcoming course is Mining Massive data sets. they are talking big data 

the book also free.

https://www.coursera.org/course/mmds

another one specialisation is there for that you can pay and get verified certificate

Data science by Hopkins university

https://www.coursera.org/specialization/jhudatascience/1?utm_medium=listingPage

As Muhammad said coursera has lot of courses.

upcoming course is Mining Massive data sets. they are talking big data 

the book also free.

https://www.coursera.org/course/mmds

another one specialisation is there for that you can pay and get verified certificate

Data science by Hopkins university

https://www.coursera.org/specialization/jhudatascience/1?utm_medium=listingPage

coursera.org

Thank you Raja, Thank you Muhammad. I will go through the website. 

I've gone through the first two of the total ten Data Science certification courses on coursera.org taught by Johns Hopkins Medical researchers. These first two courses introduce the field of data science along with the R statistical programming language using R Studio. The courses are definitely challenging and force you to get up to speed quickly.

Hi,

      i have already experience of all these because i had started from scratch! i would like to recommend you first bigdataUniversity course and exercise, when you will have little grip of these basic course then move to Coursera. Coursera have very large scenario and big data which make confuse for beginners!

Thank you Sharif...

Hi Mohan,

I am sure that you have some good places to start from today's massive open online course providers like: Coursera, EdX, iTunesU, Stanford, Udacity, ... . Nevertheless, I strongly recommend you to look at MIT's course: Tackling the Challenges of Big Data.

From Course Description:

This Online X Programs course will survey state-of-the-art topics in Big Data, looking at data collection (smartphones, sensors, the Web), data storage and processing (scalable relational databases, Hadoop, Spark, etc.), extracting structured data from unstructured data, systems issues (exploiting multicore, security), analytics (machine learning, data compression, efficient algorithms), visualization, and a range of applications.rom course description).

Good luck!

https://mitprofessionalx.edx.org/courses

MIT course is good but there is one problem Dr.Ricardo Matias. that course is $545x2=$1090 (67503 Indian Rupees) that is not affordable for us. May be for rich peoples. Most of the education in India are costly(my opinion). I think education should not be this costly. So other MOOCs are good. I think.