Additional features, settings, or issues not covered by specific Microsoft Teams categories
There are a few courses on WSL which you can do, I have linked one below. I would suggest RedHat or Ubuntu's training programs if you want to specifically concentrate on a Linux Distro.
https://learn.microsoft.com/en-us/training/modules/wsl/wsl-introduction/
https://learn.microsoft.com/en-us/training/paths/azure-linux/
Most of the training programs on MSLearn are around how to use a distro or VM on an Azure environment or using SQL on the same.