I would recommend Harvard Stat 110 over MIT's probability courses - https://www.edx.org/course/introduction-to-probability (you can find full lectures on youtube and the book online)
[0] https://youtube.com/playlist?list=PL2SOU6wwxB0uwwH80KTQ6ht66...
[1] https://drive.google.com/file/d/1VmkAAGOYCTORq1wxSQqy255qLJj...