I don't recommend coursera. I signed up for a 7 day free trial for an R Programming and Python Programming course and they charged me on day 5 of 7 and told me the charge was "non-refundable". I tried to call them by phone and quickly realized that there is no way to even contact these people. That is a HUGE RED FLAG for me. Any company that is unwilling to provide live customer service support is not a company I want to do business with.