You can contribute on the repository by pushing new PRs. You will need to accept AdaCore's Contributor License Agreement (CLA).
In case you see an issue, you can use the GitHub ticketing system to open an issue, or send a mail to training@adacore.com
There is no patterns for the PR name, a category of branches names is reserved for AdaCore's internal use:
- Training feedbacks
training/YYYY_MM_RNwith YYYY = year, MM = month, R = region, N = number