driftWood

I find Wikipedia to be a great source for learning new topics. I know you asked for videos, but you can still give it a shot. Plus you can take detours while reading about a topic by clicking on links in the article. This gives a more well-rounded understanding IMO.

If you want extra users I believe you can create them in ignition file, so that way they get created when MicroOS is deployed.

Basically anything you want as part of ‘default’ setup has to be configured via ignition file.