[davidbensoussan]

I don't think this is a thing unfortunately. I can only think of the seasonal ROS Industrial trainings that are quite expensive.

Other than this, most material are available for free, but I would agree no direct pointers.

You have the ros community available for help on answers.ros.org, the discourse for more general questions and finally some slack community like the nav2 managed by Steve Macenski, the main contributor.

The Construct is probably the closest you can get.