https://openlearninglibrary.mit.edu/courses/course-v1:MITx+6.036+1T2019/about
MIT has grading homework system, so you know if you really understand or not
https://www.youtube.com/playlist?list=PLoROMvodv4rMiGQp3WXShtMGgzqpfVfbU
https://openlearninglibrary.mit.edu/courses/course-v1:MITx+6.036+1T2019/about
MIT has grading homework system, so you know if you really understand or not
https://www.youtube.com/playlist?list=PLoROMvodv4rMiGQp3WXShtMGgzqpfVfbU