Programming:

Python from scratch

Python Programming - University of Waterloo

Operations Research:

Introduction to Operations Research, IIT Madras 

Fundamentals of Operations Research, IIT Madras 

Advanced Operations Research, IIT Madras 

Hands-On Mathematical Optimization with Python

Optimizing with Column Generation

Transportation Data Science:

Transportation Data Science - University of Kentucky

Machine Learning:

An Introduction to Statistical Learning 

The Elements of Statistical Learning 

CS229 - Machine Learning by Andrew Ng 

Statistics:

Graduate Statistics I - Richard Williams 

Graduate Statistics II - Richard Williams 

Graduate Statistics III - Richard Williams 

Deep Learning:

Neural Networks and Deep Learning  

Deep Learning 

Dive into Deep Learning