I found the EdX course too rushed (assuming you don't pay for the verification to get lifetime access). I like Bliztstein, so I instead used his Youtube playlist [0]. It has his full lectures. Also, his book is free to view [1].

[0] https://youtube.com/playlist?list=PL2SOU6wwxB0uwwH80KTQ6ht66...

[1] https://drive.google.com/file/d/1VmkAAGOYCTORq1wxSQqy255qLJj...