Good Materisls.

Algorithms:
1. MIT https://lnkd.in/e46-T-T
2. IIT https://lnkd.in/esscG7A
3. cp-algorithms.com

Machine Learning:
1. Harvard https://lnkd.in/ebgnvvS
2. Caltech https://lnkd.in/eBV_qPW
3. By Ali Ghodsi https://lnkd.in/e3rQD6U
4. fast.ai

Statistics:
1. Harvard https://lnkd.in/e3t5nQY

Practice:
1. https://leetcode.com/
2. https://lnkd.in/em_fBTP
3. https://lnkd.in/eeic39K

C++:
1. learncpp.com
2. https://www.cplusplus.com/