Coursera is one of the best platforms to develop your skills and explore your interests. The site is in collaboration with many top universities such as Stanford, Harvard, Sydney and the rest. It is a well recognized platform as well. I am not commenting just on heard talks, but I myself took some courses on python and, at the end of the day I was completely satisfied with the quality of content I got to learn. It acts more as a boost to your CV , although you cant expect it to get you jobs single-handedly. But yes, it surely gives you an upper hand in the rat-race for a job. From pharmacy, engineering, creative writing to problem analytics, coding, business management, there are courses for all fields.