The hats in the discrete optimization course are indeed good and it's a fun course. Highly recommended!
It's extremely rare that I find myself needing to pull out the big boy tools in $DAYJOB but it's good to know they exist and how to use them. Helped out in one of the later days of advent of code, too.
- https://www.coursera.org/learn/discrete-optimization good hats. very fun.
- https://www.coursera.org/learn/basic-modeling