Rez can be quite useful in visual effects pipelines. It's a handy package and environment manager.
In this post I will list some helpful resources for getting started with rez. Rather than trying to explain how to work with it, I will link some resources and sample package repositories that might be helpful when setting it up.
Docs, various resources
Sample rez package repositories
Rez alternatives
Some might be discontinued, or solving a slightly different problem, but might be still relevant when researching alternatives.
If you know of more rez resources, or alternatives then please let me know, I will update this post.