I am a Junior(3rd year) in my bachelor's in engineering in India. I have taken many online courses(some of which I have certificates for) from platforms like Coursera, Stanford Online,et al. ; many of which have the subject matter such as to cover up the basic prerequisites given by most colleges for PhD admission. For example, I have taken a course in QM conducted by Stanford Online (and also have a certificate of completion) which was pretty rigorous and covered almost all of the syllabus of QM taken in bachelors.
I want to know how much, if any, weight-age do the admissions committee give to such certificates. Will it be beneficial when I apply for PhD or am I just wasting my time taking these online courses ??