What information to put in Bibliography for a Online Course
It should be appropriate to acknowledge the "head-start" you got from that course in the acknowledgements section of the thesis. It would be unusual to list a course in the bibliography unless there really was no more authoritative source available for some information or a method that you directly used.

The purpose of a bibliography is to cite the primary source of any information directly used in your work. If you use something from the online course worth citing, then you should cite it. However, it's unlikely the information in the course is new, so you should try to track down and cite the original source in a peer-reviewed article or textbook.