I've completed and can recommend all of these if the topics are of interest to you:

https://www.coursera.org/learn/basic-modeling

https://www.coursera.org/specializations/algorithms

https://www.coursera.org/learn/discrete-optimization

https://www.coursera.org/learn/programming-languages

I'm still working my way through this one but it's been good so far:

https://www.coursera.org/specializations/data-structures-alg...