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.
- The Construct (ROS training courses): https://www.theconstructsim.com/
- ROS Discourse (forums): https://discourse.ros.org/
- Foxglove Community Slack (plenty of folks willing to answer questions): https://foxglove.dev/slack
You can check out my blog (https://msadowski.github.io/) and if my experience seems relevant then feel free to reach out through email (you will find it on my profile on HN) to see if we can make it work.