Thomas Snyder, the creator of this blog (who gathered a number of contributors throughout the years; recently slowed down the content) is a puzzle grandmaster and recently mind behind the popular LinkedIn queens game. Lots of great content on this website.
It has only week on Linear Programming which is nicely done but I think the real value is that it starts with the much more playful Constraint programming and focuses on intuitions and keeping you both entertained and trained which is really hard to do.
The course comes with assignments and the whole thing sort of has a Advent of Code flavor (I kind of have a half baked plan on make this year discrete optimization my AOC theme).
Not strong on the modeling part/business motivation.
I have never heard any serious criticism about this feature for anyone actually trying the language.
When there was a proposal to remove it just for the sake of this kind of arguments I actually took time to think about it and I actually ended it liking it.
Related, interview about LinkedIn games: https://www.linkedin.com/pulse/king-queens-world-sudoku-cham...
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