I want some resources (tutorials, online courses, lecture notes, articles, books, etc.) to learn the different techniques to solve OR problems (metaheuristics, CP, MILP, etc).
It would be better if the resources are practice-oriented, as near as possible to what is actually used in the industry.
Edit: In order to make this question less broad, my background is an MS in applied mathematics with some theoretic-oriented courses in OR. For example, we had some lectures on metaheuristics but we didn't implement any of them. Where can I find some source code or some tutorials that have an open-source code? Same for some techniques used to solve MILP, branch and bound, cutting planes, decomposition methods etc.
The bottom-line : I want to see some codes or some practical insights on using those techniques.
Edit 2 : I am looking for is some small pieces of code that help reproduce methods described in papers rather than entire libraries/ general softwares.